request-pull: capitalise "Git" to make it a proper noun

Of the many ways to spell the three-letter word, the variant "Git"
should be used when referring to a repository in a description; or, in
general, when it is used as a proper noun.

We thus change the pull-request template message so that it reads

   "...in the Git repository at:"

Besides, this brings us in line with the documentation, see
Documentation/howto/using-signed-tag-in-pull-request.txt

Signed-off-by: Ann T Ropea <bedhanger@gmx.de>
Acked-by: Jonathan Nieder <jrnieder@gmail.com>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: bedhanger

git-request-pull.sh

@@ -128,7 +128,7 @@ git show -s --format='The following changes since commit %H:
 
   %s (%ci)
 
-are available in the git repository at:
+are available in the Git repository at:
 ' $merge_base &&
 echo "  $url $pretty_remote" &&
 git show -s --format='

t/t5150-request-pull.sh

@@ -68,7 +68,7 @@ test_expect_success 'setup: two scripts for reading pull requests' '
 	cat <<-\EOT >read-request.sed &&
 	#!/bin/sed -nf
 	# Note that a request could ask for "tag $tagname"
-	/ in the git repository at:$/!d
+	/ in the Git repository at:$/!d
 	n
 	/^$/ n
 	s/ tag \([^ ]*\)$/ tag--\1/
@@ -192,7 +192,7 @@ test_expect_success 'pull request format' '
 
 	  SUBJECT (DATE)
 
-	are available in the git repository at:
+	are available in the Git repository at:
 
 	  URL BRANCH