Close #4461 - Use rust-analyzer by default

Use rust-analyzer by default instead of rls, as rls has been deprecated.

autoload/ale/linter.vim

@@ -53,7 +53,7 @@ let s:default_ale_linters = {
 \   'perl': ['perlcritic'],
 \   'perl6': [],
 \   'python': ['flake8', 'mypy', 'pylint', 'pyright', 'ruff'],
-\   'rust': ['cargo', 'rls'],
+\   'rust': ['analyzer', 'cargo'],
 \   'spec': [],
 \   'text': [],
 \   'vader': ['vimls'],

doc/ale-rust.txt

@@ -33,11 +33,12 @@ Integration Information
   5. rustfmt -- If you have `rustfmt` installed, you can use it as a fixer to
      consistently reformat your Rust code.
 
-  Only cargo and rls are enabled by default. To switch to using rustc instead
-  of cargo, configure |g:ale_linters| appropriately: >
+  Only cargo and rust-analyze are enabled by default. To switch to using rustc
+  instead of cargo, configure |b:ale_linters| in your ftplugin file
+  appropriately: >
 
   " See the help text for the option for more information.
-  let g:ale_linters = {'rust': ['rustc', 'rls']}
+  let b:ale_linters = ['analyzer', 'rustc']
 <
 
   Also note that rustc 1.18. or later is needed.

doc/ale.txt

@@ -1653,7 +1653,7 @@ g:ale_linters                                                   *g:ale_linters*
   \   'perl': ['perlcritic'],
   \   'perl6': [],
   \   'python': ['flake8', 'mypy', 'pylint', 'pyright', 'ruff'],
-  \   'rust': ['cargo', 'rls'],
+  \   'rust': ['analyzer', 'cargo'],
   \   'spec': [],
   \   'text': [],
   \   'vader': ['vimls'],

test/test_filetype_linter_defaults.vader

@@ -90,7 +90,7 @@ Execute(The defaults for the python filetype should be correct):
   AssertEqual [], GetLinterNames('python')
 
 Execute(The defaults for the rust filetype should be correct):
-  AssertEqual ['cargo', 'rls'], GetLinterNames('rust')
+  AssertEqual ['analyzer', 'cargo'], GetLinterNames('rust')
 
   let g:ale_linters_explicit = 1