Fix typo in rule docs generation (palantir#4638)

Incorrect rule type selector in rules documentation page was omitting the following rules:

* `align`
* `arrow-parens`
* `eofline`
* `import-spacing`
* `indent`
* `jsdoc-format`
* `linebreak-style`
* `max-line-length`
* `newline-before-return`
* `new-parens`
* `no-consecutive-blank-lines`
* `no-irregular-whitespace`
* `no-trailing-whitespace`
* `number-literal-format`
* `quotemark`
* `semicolon`
* `trailing-comma`
* `typedef-whitespace`
* `whitespace`

Author: komputerwiz

docs/rules/index.md

@@ -36,4 +36,4 @@ _These rules enforce consistent style across your codebase_:
 
 _These rules enforce consistent use of whitespace and punctuation_:
 
-{% include rule_list.html ruleType="format" %}
+{% include rule_list.html ruleType="formatting" %}