[llvm] [llvm-lit] Resolve env subcommand required error (PR #98414)

[James Henderson via llvm-commits]

================
@@ -1 +1,30 @@
-# RUN: env
+# Check Default Environment
----------------
jh7370 wrote:

```suggestion
# Check Default Environment.
```
Nit: comments should end with a '.'. Also, does this really need a capital 'd' and 'e'? Same throughout.

https://github.com/llvm/llvm-project/pull/98414