[llvm] [test] Fix documentation of %{fs-sep} et al (PR #95088)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-testing-tools

Author: Jay Foad (jayfoad)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/95088.diff


1 Files Affected:

- (modified) llvm/docs/TestingGuide.rst (+3-3) 


``````````diff
diff --git a/llvm/docs/TestingGuide.rst b/llvm/docs/TestingGuide.rst
index 89499d8b937d5..c35e58bc53b67 100644
--- a/llvm/docs/TestingGuide.rst
+++ b/llvm/docs/TestingGuide.rst
@@ -741,16 +741,16 @@ RUN lines:
 
    Expands to the path separator, i.e. ``:`` (or ``;`` on Windows).
 
-``${fs-src-root}``
+``%{fs-src-root}``
    Expands to the root component of file system paths for the source directory,
    i.e. ``/`` on Unix systems or ``C:\`` (or another drive) on Windows.
 
-``${fs-tmp-root}``
+``%{fs-tmp-root}``
    Expands to the root component of file system paths for the test's temporary
    directory, i.e. ``/`` on Unix systems or ``C:\`` (or another drive) on
    Windows.
 
-``${fs-sep}``
+``%{fs-sep}``
    Expands to the file system separator, i.e. ``/`` or ``\`` on Windows.
 
 ``%/s, %/S, %/t, %/T``

``````````

</details>


https://github.com/llvm/llvm-project/pull/95088