Fix typo in 'blame' documentation.

Signed-off-by: NTim Stoakes <tim@stoakes.net>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Documentation/blame-options.txt

@@ -52,7 +52,7 @@ of lines before or after the line given by <start>.
 	When <rev> is not specified, the command annotates the
 	changes starting backwards from the working tree copy.
 	This flag makes the command pretend as if the working
-	tree copy has the contents of he named file (specify
+	tree copy has the contents of the named file (specify
 	`-` to make the command read from the standard input).
 
 -M|<num>|::