Add lexical for linting elixir projects (#4580)

doc/ale-elixir.txt

@@ -104,5 +104,23 @@ cspell                                                      *ale-elixir-cspell*
 See |ale-cspell-options|
 
 
+===============================================================================
+lexical                                                    *ale-elixir-lexical*
+
+Lexical (https://github.com/lexical-lsp/lexical)
+
+g:ale_elixir_lexical_release                     *g:ale_elixir_lexical_release*
+                                                 *b:ale_elixir_lexical_release*
+  Type: |String|
+  Default: `'lexical'`
+
+  Location of the lexical release directory. This directory must contain
+  the language server scripts (start_lexical.sh and start_lexical.bat).
+
+  For example, set release to: `/home/projects/lexical/_build/dev/rel/lexical`
+
+  There are currnetly no configuration options for lexical.
+
+
 ===============================================================================
   vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:

doc/ale-supported-languages-and-tools.txt

@@ -168,6 +168,7 @@ Notes:
   * `dialyxir`
   * `dogma`!!
   * `elixir-ls`
+  * `lexical`
   * `mix`!!
 * Elm
   * `elm-format`

doc/ale.txt

@@ -2993,6 +2993,7 @@ documented in additional help files.
     elixir-ls.............................|ale-elixir-elixir-ls|
     credo.................................|ale-elixir-credo|
     cspell................................|ale-elixir-cspell|
+    lexical...............................|ale-elixir-lexical|
   elm.....................................|ale-elm-options|
     elm-format............................|ale-elm-elm-format|
     elm-ls................................|ale-elm-elm-ls|