Merge #8759

8759: docs: Add Kate installation section r=matklad a=meven

Replaces https://github.com/rust-analyzer/rust-analyzer.github.io/pull/111#issuecomment-834797031

Co-authored-by: Méven Car <meven29@gmail.com>

docs/user/manual.adoc

@@ -383,6 +383,33 @@ If available in PATH or in some standard location, `rust-analyzer` is detected a
 If `rust-analyzer` is not detected, Corrosion will prompt you for configuration of your Rust toolchain and language server with a link to the __Window > Preferences > Rust__ preference page; from here a button allows to download and configure `rust-analyzer`, but you can also reference another installation.
 You'll need to close and reopen all .rs and Cargo files, or to restart the IDE, for this change to take effect.
 
+=== Kate Text Editor
+
+Support for the language server protocol is built into Kate through the LSP plugin, which is included by default.
+It is preconfigured to use Rls for rust sources, but allows you to use rust-analyzer through a simple settings change.
+In the LSP Client settings of Kate, copy the content of the third tab "default parameters" to the second tab "server configuration".
+Then in the configuration replace:
+[source,json]
+----
+        "rust": {
+            "command": ["rls"],
+            "rootIndicationFileNames": ["Cargo.lock", "Cargo.toml"],
+            "url": "https://github.com/rust-lang/rls",
+            "highlightingModeRegex": "^Rust$"
+        },
+----
+With
+[source,json]
+----
+        "rust": {
+            "command": ["rust-analyzer"],
+            "rootIndicationFileNames": ["Cargo.lock", "Cargo.toml"],
+            "url": "https://github.com/rust-analyzer/rust-analyzer",
+            "highlightingModeRegex": "^Rust$"
+        },
+----
+Then click on apply, and restart the LSP server for your rust project.
+
 == Configuration
 
 **Source:** https://github.com/rust-analyzer/rust-analyzer/blob/master/crates/rust-analyzer/src/config.rs[config.rs]