git-rev-list.txt: fix Asciidoc syntax

Using '{caret}' inside double quotes and immediately following with a
single quoted word does not create the desired output: '<commit1>'
appears verbatim instead of being emphasized.

Use a litteral caret ('^') instead.

Also, remove the leading tabs in shell examples to bring them more in
line with the rest of the documentation.

Signed-off-by: Philippe Blain <levraiphilippeblain@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-rev-list.txt

@@ -29,19 +29,19 @@ to further limit the result.
 Thus, the following command:
 
 -----------------------------------------------------------------------
-	$ git rev-list foo bar ^baz
+$ git rev-list foo bar ^baz
 -----------------------------------------------------------------------
 
 means "list all the commits which are reachable from 'foo' or 'bar', but
 not from 'baz'".
 
 A special notation "'<commit1>'..'<commit2>'" can be used as a
-short-hand for "{caret}'<commit1>' '<commit2>'". For example, either of
+short-hand for "^'<commit1>' '<commit2>'". For example, either of
 the following may be used interchangeably:
 
 -----------------------------------------------------------------------
-	$ git rev-list origin..HEAD
+$ git rev-list origin..HEAD
-	$ git rev-list HEAD ^origin
+$ git rev-list HEAD ^origin
 -----------------------------------------------------------------------
 
 Another special notation is "'<commit1>'...'<commit2>'" which is useful
@@ -49,8 +49,8 @@ for merges.  The resulting set of commits is the symmetric difference
 between the two operands.  The following two commands are equivalent:
 
 -----------------------------------------------------------------------
-	$ git rev-list A B --not $(git merge-base --all A B)
+$ git rev-list A B --not $(git merge-base --all A B)
-	$ git rev-list A...B
+$ git rev-list A...B
 -----------------------------------------------------------------------
 
 'rev-list' is a very essential Git command, since it