Auto merge of rust-lang#15234 - alibektas:14882, r=alibektas

Remind user to check $PATH after installation.

fixes rust-lang#14882 . I don't think that this is the correct wording to express this but I at least wanted to take the initiative :)

docs/user/manual.adoc

@@ -141,6 +141,9 @@ If you're not using Code, you can compile and install only the LSP server:
 $ cargo xtask install --server
 ----
 
+Make sure that `.cargo/bin` is in `$PATH` and precedes paths where `rust-analyzer` may also be installed.
+Specifically, `rustup` includes a proxy called `rust-analyzer`, which can cause problems if you're planning to use a source build or even a downloaded binary.
+
 === rust-analyzer Language Server Binary
 
 Other editors generally require the `rust-analyzer` binary to be in `$PATH`.