Re: [PATCH v2 02/13] t6120-describe: modernize the 'check_describe' helper

The 'check_describe' helper function runs 'git describe' outside of
'test_expect_success' blocks, with extra hand-rolled code to record
and examine its exit code.

Update this helper and move the 'git decribe' invocation inside the
'test_expect_success' block.

decribe -> describe

Otherwise, patches 1 and 2 are relatively straightforward and look good
to me.