[llvm] [llvm][docs] Correct description of %t lit substitution (PR #164397)

[David Spickett via llvm-commits]

================
@@ -628,7 +628,7 @@ TestRunner.py:
  %{fs-src-root}          root component of file system paths pointing to the LLVM checkout
  %{fs-tmp-root}          root component of file system paths pointing to the test's temporary directory
  %{fs-sep}               file system path separator
- %t                      temporary file name unique to the test
+ %t                      the path of a temporary file unique to the test
----------------
DavidSpickett wrote:

Updated, see what you think of it now.

https://github.com/llvm/llvm-project/pull/164397