Documentation: Spelling fixes

Signed-off-by: Horst H. von Brand <vonbrand@inf.utfsm.cl>
Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/Documentation/git-grep.txt b/Documentation/git-grep.txt
index 74102b7..7b810df 100644
--- a/Documentation/git-grep.txt
+++ b/Documentation/git-grep.txt
@@ -30,7 +30,7 @@
 -------
 --cached::
 	Instead of searching in the working tree files, check
-	the blobs registerd in the index file.
+	the blobs registered in the index file.
 
 -a | --text::
 	Process binary files as if they were text.
@@ -65,7 +65,7 @@
 -[ABC] <context>::
 	Show `context` trailing (`A` -- after), or leading (`B`
 	-- before), or both (`C` -- context) lines, and place a
-	line containing `--` between continguous groups of
+	line containing `--` between contiguous groups of
 	matches.
 
 -f <file>::