Add support for erlfmt fixer (#3602)

* Add support for `erlfmt`

* Add missing entry to table of contents

* Fix warnings

* Add missing tools to supported tools

doc/ale-erlang.txt

@@ -71,6 +71,26 @@ g:ale_erlang_erlc_options                           *g:ale_erlang_erlc_options*
   or `-pa`.
 
 
+-------------------------------------------------------------------------------
+erlfmt                                                      *ale-erlang-erlfmt*
+
+g:ale_erlang_erlfmt_executable                 *g:ale_erlang_erlfmt_executable*
+                                               *b:ale_erlang_erlfmt_executable*
+  Type: |String|
+  Default: `'erlfmt'`
+
+  This variable can be changed to specify the erlfmt executable.
+
+
+g:ale_erlang_erlfmt_options                       *g:ale_erlang_erlfmt_options*
+                                                  *b:ale_erlang_erlfmt_options*
+  Type: |String|
+  Default: `''`
+
+  This variable controls additional parameters passed to `erlfmt`, such as
+  `--insert-pragma` or `--print-width`.
+
+
 -------------------------------------------------------------------------------
 syntaxerl                                                *ale-erlang-syntaxerl*
 

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

@@ -150,8 +150,10 @@ Notes:
   * `ruumba`
 * Erlang
   * `SyntaxErl`
+  * `dialyzer`
   * `elvis`!!
   * `erlc`
+  * `erlfmt`
 * Fish
   * `fish` (-n flag)
   * `fish_indent`

doc/ale.txt

@@ -2697,6 +2697,7 @@ documented in additional help files.
     dialyzer..............................|ale-erlang-dialyzer|
     elvis.................................|ale-erlang-elvis|
     erlc..................................|ale-erlang-erlc|
+    erlfmt................................|ale-erlang-erlfmt|
     syntaxerl.............................|ale-erlang-syntaxerl|
   eruby...................................|ale-eruby-options|
     ruumba................................|ale-eruby-ruumba|