t0410: make test description clearer

Commit 9a4c507 (t0410: test fetching from many promisor remotes,
2019-06-25) adds some tests that demonstrate not the automatic fetching
of missing objects, but the direct fetching from another promisor remote
(configured explicitly in one test and implicitly via --filter on the
"git fetch" CLI invocation in the other test) - thus demonstrating
support for multiple promisor remotes, as described in the commit
message.

Change the test descriptions accordingly to make this clearer.

Signed-off-by: Jonathan Tan <[email protected]>
Signed-off-by: Taylor Blau <[email protected]>

Author: jonathantanmy

t/t0410-partial-clone.sh

@@ -241,7 +241,7 @@ test_expect_success 'fetching of missing objects works with ref-in-want enabled'
 	grep "fetch< fetch=.*ref-in-want" trace
 '
 
-test_expect_success 'fetching of missing objects from another promisor remote' '
+test_expect_success 'fetching from another promisor remote' '
 	git clone "file://$(pwd)/server" server2 &&
 	test_commit -C server2 bar &&
 	git -C server2 repack -a -d --write-bitmap-index &&
@@ -264,7 +264,7 @@ test_expect_success 'fetching of missing objects from another promisor remote' '
 	grep "$HASH2" out
 '
 
-test_expect_success 'fetching of missing objects configures a promisor remote' '
+test_expect_success 'fetching with --filter configures a promisor remote' '
 	git clone "file://$(pwd)/server" server3 &&
 	test_commit -C server3 baz &&
 	git -C server3 repack -a -d --write-bitmap-index &&