Documentation/git-tag: the command can be used to also verify a tag.

Signed-off-by: Junio C Hamano <junkio@cox.net>

Documentation/git-tag.txt

@@ -3,7 +3,7 @@ git-tag(1)
 
 NAME
 ----
-git-tag - Create a tag object signed with GPG
+git-tag - Create or verify a tag object signed with GPG
 
 
 SYNOPSIS

Documentation/git.txt

@@ -246,7 +246,7 @@ gitlink:git-symbolic-ref[1]::
 	Read and modify symbolic refs.
 
 gitlink:git-tag[1]::
-	An example script to create a tag object signed with GPG.
+	Create or verify a tag object signed with GPG.
 
 gitlink:git-update-ref[1]::
 	Update the object name stored in a ref safely.