[dajiaohuang]

Document declaration-level nolint with a verified redundant-initializer example, its scope, and the difference from editor-only ignore settings and stable v0.15.2.

Actual execution against master 457fab85a73763f2dfc392395299107faed260cd showed that the original C-binding example in this PR still emits the naming warning, even on a build containing #936. The naming checker overrides declaration visitation without the suppression handling in BaseAnalyzer. This revision removes the ineffective example, uses a working check, and explicitly documents that upgrading alone does not suppress CRYPTO_memcmp. This is a documentation correction, not a fix to the naming checker; that part of #979 remains a limitation.

Validation (WSL Ubuntu 24.04, official portable DMD 2.111.0, pinned Git submodules):

• make -j2 all: passed.
• make -j2 test: passed, 54 modules.
• Compiled the original C declaration and the revised initializer example with dmd -c.
• CLI -S/lint and JSON --report reproduced the original naming warning with and without its UDA. The replacement initializer example suppresses count while reporting the nearby unsuppressed initializer.
• README hello-world syntax/import/token/sloc CLI smoke checks passed (token output is 28 for this compiler/parser build).
• Existing tests/it.sh passed after normalizing the Windows checkout's script and text fixture line endings to LF locally. Initial CRLF execution/expected-output failures were environment-specific; no fixture or test-source changes are included in this PR.
• git diff --check: passed. No compiler/OS matrix, DUB build, external source scan, or Phobos scan was run.