many small typofixes

Signed-off-by: Ondřej Bílka <neleai@seznam.cz>
Reviewed-by: Marc Branchaud <marcnarc@xiplink.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/t/gitweb-lib.sh b/t/gitweb-lib.sh
index ae2dc46..9e381e0 100644
--- a/t/gitweb-lib.sh
+++ b/t/gitweb-lib.sh
@@ -36,7 +36,7 @@
 
 	# You can set the GITWEB_TEST_INSTALLED environment variable to
 	# the gitwebdir (the directory where gitweb is installed / deployed to)
-	# of an existing gitweb instalation to test that installation,
+	# of an existing gitweb installation to test that installation,
 	# or simply to pathname of installed gitweb script.
 	if test -n "$GITWEB_TEST_INSTALLED" ; then
 		if test -d $GITWEB_TEST_INSTALLED; then