Missing document on detailed clang-tidy checks enabled by default / disabled

[zwuis]

It's just mentioned that "Not all checks work within clangd.", which is not clear enough and may confuse users (clangd/clangd#759). These tests should be listed.

Current document and disabled checks:

clangd-www/features.md

Lines 41 to 42 in a3b06b5

	clangd respects your project's `.clang-tidy` file which controls the checks to
	run. Not all checks work within clangd.

https://github.com/llvm/llvm-project/blob/75ad8b23c0f430bcf3a783c50ef53b926147dff7/clang-tools-extra/clangd/TidyProvider.cpp#L197-L224

---

Some clang-tidy checks are enabled when there is no configuration in ".clangd" and ".clang-tidy" files (I tested with clangd 18.1.8 but didn't check the source code). I think it can be documented.

Checks enabled by default:

https://github.com/llvm/llvm-project/blob/75ad8b23c0f430bcf3a783c50ef53b926147dff7/clang-tools-extra/clangd/TidyProvider.cpp#L170-L185

[capitan-davide]

I think that it should also be clarified whether "Not all checks work within clangd." means that there are technical limitations that prevents some checks to work. If so, what are these limitations?