Consistently use @minus{} for negative arguments

* doc/emacs/mark.texi (Marking Objects):
* doc/misc/gnus.texi (Selecting a Group):
* doc/emacs/programs.texi (Comment Commands):
* doc/emacs/killing.texi (Deletion):
* doc/emacs/display.texi (Recentering):
* doc/lispref/display.texi (Face Attributes):
* doc/lispref/searching.texi (String Search, Regexp Search):
Make the markup of "-N" use @minus{} uniformly.  (Bug#35885)

doc/emacs/display.texi

@@ -202,7 +202,7 @@ screen lines between point and the top or bottom of the window
 argument, @kbd{C-u C-l}, simply recenters the line showing point.  A
 positive argument @var{n} moves line showing point @var{n} lines down
 from the top of the window.  An argument of zero moves point's line to
-the top of the window.  A negative argument @var{-n} moves point's
+the top of the window.  A negative argument @minus{}@var{n} moves point's
 line @var{n} lines from the bottom of the window.  When given an
 argument, @kbd{C-l} does not clear the screen or cycle through
 different screen positions.

doc/emacs/killing.texi

@@ -124,7 +124,7 @@ point, regardless of the number of spaces that existed previously
 (even if there were none before).  With a numeric argument @var{n}, it
 leaves @var{n} spaces before point if @var{n} is positive; if @var{n}
 is negative, it deletes newlines in addition to spaces and tabs,
-leaving @var{-n} spaces before point.  The command @code{cycle-spacing}
+leaving @minus{}@var{n} spaces before point.  The command @code{cycle-spacing}
 acts like a more flexible version of @code{just-one-space}.  It
 does different things if you call it repeatedly in succession.
 The first call acts like @code{just-one-space}, the next removes

doc/emacs/mark.texi

@@ -193,8 +193,8 @@ located before point, @kbd{M-@@} moves the mark backwards from its
 current position one word at a time.
 
   This command also accepts a numeric argument @var{n}, which tells it
-to advance the mark by @var{n} words.  A negative argument moves the
-mark back by @var{n} words.
+to advance the mark by @var{n} words.  A negative argument
+@minus{}@var{n} moves the mark back by @var{n} words.
 
 @kindex C-M-@@
 @findex mark-sexp

doc/emacs/programs.texi

@@ -1003,7 +1003,7 @@ delimiters to enclose the text in the region.
   If you supply a prefix argument to @kbd{M-;} when a region is
 active, that specifies the number of comment delimiters to add or
 delete.  A positive argument @var{n} adds @var{n} delimiters, while a
-negative argument @var{-n} removes @var{n} delimiters.
+negative argument @minus{}@var{n} removes @var{n} delimiters.
 
   If the region is not active, and there is no existing comment on the
 current line, @kbd{M-;} adds a new comment to the current line.  If
@@ -1034,10 +1034,11 @@ lines.  When a region is active (@pxref{Mark}), @kbd{C-x C-;} either
 comments or uncomments the lines in the region.  If the region is not
 active, this command comments or uncomments the line point is on.
 With a positive prefix argument @var{n}, it operates on @var{n} lines
-starting with the current one; with a negative @var{n}, it affects
-@var{n} preceding lines.  After invoking this command with a negative
-argument, successive invocations with a positive argument will operate
-on preceding lines as if the argument were negated.
+starting with the current one; with a negative argument
+@minus{}@var{n}, it affects @var{n} preceding lines.  After invoking
+this command with a negative argument, successive invocations with a
+positive argument will operate on preceding lines as if the argument
+were negated.
 
 @findex comment-kill
 @kindex C-u M-;

doc/lispref/display.texi

@@ -2369,7 +2369,7 @@ Draw a box with lines of width 1, in color @var{color}.
 @item @code{(:line-width @var{width} :color @var{color} :style @var{style})}
 This way you can explicitly specify all aspects of the box.  The value
 @var{width} specifies the width of the lines to draw; it defaults to
-1.  A negative width @var{-n} means to draw a line of width @var{n}
+1.  A negative width @minus{}@var{n} means to draw a line of width @var{n}
 whose top and bottom parts occupy the space of the underlying text,
 thus avoiding any increase in the character height.
 

doc/lispref/searching.texi

@@ -101,7 +101,7 @@ previous match.  If all these successive searches succeed, the
 function call succeeds, moving point and returning its new value.
 Otherwise the function call fails, with results depending on the value
 of @var{noerror}, as described above.  If @var{count} is a negative
-number -@var{n}, the search is done @var{n} times in the opposite
+number @minus{}@var{n}, the search is done @var{n} times in the opposite
 (backward) direction.
 @end deffn
 
@@ -1091,7 +1091,7 @@ previous match.  If all these successive searches succeed, the
 function call succeeds, moving point and returning its new value.
 Otherwise the function call fails, with results depending on the value
 of @var{noerror}, as described above.  If @var{count} is a negative
-number -@var{n}, the search is done @var{n} times in the opposite
+number @minus{}@var{n}, the search is done @var{n} times in the opposite
 (backward) direction.
 
 In the following example, point is initially before the @samp{T}.

doc/misc/gnus.texi

@@ -2128,7 +2128,7 @@ considered big.  The default value is 200.  If the group has more
 (unread and/or ticked) articles than this, Gnus will query the user
 before entering the group.  The user can then specify how many
 articles should be fetched from the server.  If the user specifies a
-negative number (@var{-n}), the @var{n} oldest articles will be
+negative number (@minus{}@var{n}), the @var{n} oldest articles will be
 fetched.  If it is positive, the @var{n} articles that have arrived
 most recently will be fetched.