Use @key for TAB.

man/cc-mode.texi

@@ -4883,7 +4883,7 @@ our first example again:
  6: @}
 @end example
 
-Let's say point is on line 3 and we hit the @kbd{TAB} key to reindent
+Let's say point is on line 3 and we hit the @key{TAB} key to reindent
 the line.  The syntactic context for that line is:
 
 @example

man/ebrowse.texi

@@ -979,11 +979,11 @@ a mouse.
 @cindex switching buffers
 
 @table @kbd
-@item TAB
+@item @key{TAB}
 Pop up the tree buffer to which the member buffer belongs.
 
 @item t
-Do the same as @kbd{TAB} but also position the cursor on the class
+Do the same as @key{TAB} but also position the cursor on the class
 displayed in the member buffer.
 @end table
 
@@ -1433,7 +1433,7 @@ command @kbd{C-c b f}, for example, to jump to a specific member.
 @cindex completion
 @cindex symbol completion
 
-The command @kbd{C-c b TAB} completes the symbol in front of point.
+The command @kbd{C-c b @key{TAB}} completes the symbol in front of point.
 
 
 

man/kmacro.texi

@@ -521,8 +521,8 @@ next command in the keyboard macro.
 @kbd{f} skips the current command in this execution of the keyboard
 macro, but doesn't delete it from the macro.
 @item
-@kbd{TAB} executes the current command, as well as all similar
-commands immediately following the current command; for example, TAB
+@kbd{@key{TAB}} executes the current command, as well as all similar
+commands immediately following the current command; for example, @key{TAB}
 may be used to insert a sequence of characters (corresponding to a
 sequence of @code{self-insert-command} commands).
 @item

man/ses.texi

@@ -188,12 +188,12 @@ Self-insert an expression.  The right-parenthesis is inserted for you
 (@code{ses-read-cell}).  To access another cell's value, just use its
 identifier in your expression.  Whenever the other cell is changed,
 this cell's formula will be reevaluated.  While typing in the
-expression, you can use @kbd{M-TAB} to complete symbol names.
+expression, you can use @kbd{M-@key{TAB}} to complete symbol names.
 
 @item ' @r{(apostrophe)}
 Enter a symbol (ses-read-symbol).  SES remembers all symbols that have
 been used as formulas, so you can type just the beginning of a symbol
-and use @kbd{SPC}, @kbd{TAB}, and @kbd{?} to complete it.
+and use @kbd{@key{SPC}}, @kbd{@key{TAB}}, and @kbd{?} to complete it.
 @end table
 
 To enter something else (e.g., a vector), begin with a digit, then
@@ -287,7 +287,7 @@ string is right-aligned within the print cell.  To get left-alignment,
 use parentheses: @samp{("$%.2f")}.  A printer can also be a
 one-argument function (a symbol or a lambda), whose result is a string
 (right-aligned) or list of one string (left-aligned).  While typing in
-a lambda, you can use @kbd{M-TAB} to complete the names of symbols.
+a lambda, you can use @kbd{M-@key{TAB}} to complete the names of symbols.
 
 Each cell has a printer.  If @code{nil}, the column-printer for the cell's
 column is used.  If that is also @code{nil}, the default-printer for the

man/text.texi

@@ -1680,12 +1680,12 @@ Variables}.
   For La@TeX{} files, you can use Bib@TeX{} to process the auxiliary
 file for the current buffer's file.  Bib@TeX{} looks up bibliographic
 citations in a data base and prepares the cited references for the
-bibliography section.  The command @kbd{C-c TAB}
+bibliography section.  The command @kbd{C-c @key{TAB}}
 (@code{tex-bibtex-file}) runs the shell command
 (@code{tex-bibtex-command}) to produce a @samp{.bbl} file for the
 current buffer's file.  Generally, you need to do @kbd{C-c C-f}
 (@code{tex-file}) once to generate the @samp{.aux} file, then do
-@kbd{C-c TAB} (@code{tex-bibtex-file}), and then repeat @kbd{C-c C-f}
+@kbd{C-c @key{TAB}} (@code{tex-bibtex-file}), and then repeat @kbd{C-c C-f}
 (@code{tex-file}) twice more to get the cross-references correct.
 
 @findex tex-compile

man/widget.texi

@@ -315,7 +315,7 @@ buffer, plus you will have these additional commands:
 @deffn Command widget-forward &optional count
 Move point @var{count} buttons or editing fields forward.
 @end deffn
-@item @key{M-TAB}
+@item @kbd{M-@key{TAB}}
 @deffn Command widget-backward &optional count
 Move point @var{count} buttons or editing fields backward.
 @end deffn