t: avoid using ":" for comments

The ":" is not a comment marker, but rather a noop command.
Using it as a comment like:

  : do something
  cmd1 &&

  : something else
  cmd2

breaks the &&-chain, and we would fail to notice if "cmd1"
failed in this instance. We can just use regular "#"
comments instead.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t4104-apply-boundary.sh

@@ -18,7 +18,7 @@ test_expect_success setup '
 	cat victim >original &&
 	git update-index --add victim &&
 
-	: add to the head
+	# add to the head
 	for i in a b '"$L"' y
 	do
 		echo $i
@@ -27,7 +27,7 @@ test_expect_success setup '
 	git diff victim >add-a-patch.with &&
 	git diff --unified=0 >add-a-patch.without &&
 
-	: insert at line two
+	# insert at line two
 	for i in b a '"$L"' y
 	do
 		echo $i
@@ -36,7 +36,7 @@ test_expect_success setup '
 	git diff victim >insert-a-patch.with &&
 	git diff --unified=0 >insert-a-patch.without &&
 
-	: modify at the head
+	# modify at the head
 	for i in a '"$L"' y
 	do
 		echo $i
@@ -45,16 +45,16 @@ test_expect_success setup '
 	git diff victim >mod-a-patch.with &&
 	git diff --unified=0 >mod-a-patch.without &&
 
-	: remove from the head
+	# remove from the head
 	for i in '"$L"' y
 	do
 		echo $i
 	done >victim &&
 	cat victim >del-a-expect &&
-	git diff victim >del-a-patch.with
+	git diff victim >del-a-patch.with &&
 	git diff --unified=0 >del-a-patch.without &&
 
-	: add to the tail
+	# add to the tail
 	for i in b '"$L"' y z
 	do
 		echo $i
@@ -63,7 +63,7 @@ test_expect_success setup '
 	git diff victim >add-z-patch.with &&
 	git diff --unified=0 >add-z-patch.without &&
 
-	: modify at the tail
+	# modify at the tail
 	for i in b '"$L"' z
 	do
 		echo $i
@@ -72,7 +72,7 @@ test_expect_success setup '
 	git diff victim >mod-z-patch.with &&
 	git diff --unified=0 >mod-z-patch.without &&
 
-	: remove from the tail
+	# remove from the tail
 	for i in b '"$L"'
 	do
 		echo $i
@@ -81,7 +81,7 @@ test_expect_success setup '
 	git diff victim >del-z-patch.with &&
 	git diff --unified=0 >del-z-patch.without
 
-	: done
+	# done
 '
 
 for with in with without

t/t5533-push-cas.sh

@@ -14,7 +14,7 @@ setup_srcdst_basic () {
 }
 
 test_expect_success setup '
-	: create template repository
+	# create template repository
 	test_commit A &&
 	test_commit B &&
 	test_commit C