[cte] Add release notes for clangd-14

[kbobyrev]

Thanks for taking care of this!

clang-tools-extra/docs/ReleaseNotes.rst

54

nit: probably link to the design doc?

63

73

75

nit: desugared types? deduced types? AKA types is something I've never seen before.

78

nit: might make sense to move closer to the previous hover improvement for coherence

[kadircet]

• Address comments

[tschuett]

clang-tools-extra/docs/ReleaseNotes.rst

65

highlighting

[kadircet]

• Fix spelling of highlighting

clang-tools-extra/docs/ReleaseNotes.rst

 Major New Features
 ------------------
 
 ...
 
 Improvements to clangd
 ----------------------
 
-The improvements are...
+- `clangd/inlayHints <https://clangd.llvm.org/extensions#inlay-hints>`_
+  extension to provide hints about not directly available information in code,
+  like parameter names, deduced types and designated initializers.
+
+- Diagnostics and fixes for unused include directives, according to IWYU style.
+  Off by default, can be turned on through `Diagnostics.IncludeCleaner
+  <https://clangd.llvm.org/config#unusedincludes>`_ config option.
+
+- Implementation for `textDocument/typeDefinition` LSP request.
+
+- Relevant diagnostics are emitted with `Deprecated` and `Unnecessary` tags from
+  LSP.
+
+- New semantich hihlighting kinds for:
+  - Virtual methods
+  - Mutable reference arguments
+  - Lambda captures
+
+- Support for attributes, (e.g.  `[[nodiscard, gsl::Owner(Foo)]]`) in various
+  features like hover, code completion, go-to-definition.
+
+- `#pragma mark` directives now show up in document outline.
+
+- Hover for include directives displays resolved paths.
+
+- Include AKA types in hover, controlled with `Hover.ShowAKA
+  <https://clangd.llvm.org/config#showaka>`_ config option.
+
+- Hover supports character literals.
+
+- Diagnostic fixes in more contexts like:
+  - Incomplete type errors.
+  - Implicit symbol declarations in C.
+
+- Code completion for parameter name comments.
+
+- Provide and improve signature help for:
+  - Variadic functions
+  - Template argument lists
+  - Braced constructor calls
+  - Aggregate initializers
+  - Constructor initializers
+
+- Improved handling of short identifiers in code completion and workspace symbol
+  requests.
+
+- Improved handling of symbols introduced via using declarations.
+
+- Respect warning flags mentioned in `.clang-tidy` config files in
+  `ExtraArgs(Before)` sections.
+
+- `CompileFlags.Compiler <https://clangd.llvm.org/config#compiler>`_ config
+  option to override executable name in compile flags.
+
+- Compile flags effecting inputs (like -xc++-header) can now be added through
+  `CompileFlags.Add <https://clangd.llvm.org/config#add>`_ config option.
+
+- PopulateSwitch code action is now offered as a fix for `-Wswitch` warnings and
+  works with C/ObjC enums.
+
+- `clangd --check=/path/to/file.cpp` now reads config files in ancestor
+  directories, in addition to user config file.
+
+- Improved compile flags handling in `clangd-indexer`.
+
+- Include documentation for annotations in code completion items.
+
+- `-use-dirty-headers` command line flag to use dirty buffer contents when
+  building preambles, rather than saved on-disk contents.
+
+- Improved handling of ObjC/ObjC++ constructs.
+
+- Include request context on crashes when possible.
+
+- Various stability and performance improvements.
 
 Improvements to clang-doc
 -------------------------
 
 The improvements are...
 
 Improvements to clang-query
 ---------------------------