[DebugInfo] Remove class and function names from Doxygen comments in LexicalScopes.h (NFC)

[dzhidzhoev]

Duplication of function and class name in the comment is discouraged in https://llvm.org/docs/CodingStandards.html#doxygen-use-in-documentation-comments.

I'll be merging this immediately, as this change was requested in #159104 (comment), but I'm open to post-commit review.

[llvm-ci]

LLVM Buildbot has detected a new failure on builder ppc64le-mlir-rhel-clang running on ppc64le-mlir-rhel-test while building llvm at step 6 "test-build-check-mlir-build-only-check-mlir".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/129/builds/29675

Here is the relevant piece of the build log for the reference

Step 6 (test-build-check-mlir-build-only-check-mlir) failure: 1200 seconds without output running [b'ninja', b'check-mlir'], attempting to kill
...
PASS: MLIR-Unit :: Interfaces/./MLIRInterfacesTests/12/22 (3488 of 3499)
PASS: MLIR :: mlir-runner/utils.mlir (3489 of 3499)
PASS: MLIR-Unit :: Interfaces/./MLIRInterfacesTests/11/22 (3490 of 3499)
PASS: MLIR :: mlir-runner/verify-entry-point.mlir (3491 of 3499)
PASS: MLIR :: mlir-tblgen/cpp-class-comments.td (3492 of 3499)
PASS: MLIR :: mlir-runner/simple.mlir (3493 of 3499)
PASS: MLIR :: mlir-reduce/dce-test.mlir (3494 of 3499)
PASS: MLIR :: mlir-tblgen/op-error.td (3495 of 3499)
PASS: MLIR :: mlir-tblgen/llvm-intrinsics.td (3496 of 3499)
PASS: MLIR :: Pass/pipeline-options-parsing.mlir (3497 of 3499)
command timed out: 1200 seconds without output running [b'ninja', b'check-mlir'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=1842.764965

[dwblaikie]

(If you're creating a PR just for presubmit checks, not intending it to be reviewed/approved-before-commit, please be sure to include the skip-precommit-approval tag on it so it doesn't look like a case of "I sent this for review and then committed it without the required review")

Thanks for the cleanup!

[dzhidzhoev]

Ah, thank you for the tip!