feat: add public exports only option to require-jsdoc rule

* When enabled, require all exported function bodies to have JSDoc block
* Fixes gajus#192

.README/README.md

@@ -118,6 +118,12 @@ Finally, enable all of the rules that you would like to use.
   above functions/methods with no parameters or return values (intended where
   variable names are sufficient for themselves as documentation).
 
+<a name="eslint-plugin-jsdoc-settings-requiring-jsdoc-comments-for-exported-functions-in-require-jsdoc"></a>
+### Requiring JSDoc comments for exported functions in <code>require-jsdoc</code>
+
+- `settings.jsdoc.publicFunctionsOnly` - Missing jsdoc blocks
+  are only reported for function bodies that are exported from the module.
+
 ### Alias Preference
 
 Use `settings.jsdoc.tagNamePreference` to configure a preferred alias name for a JSDoc tag. The format of the configuration is: `<primary tag name>: <preferred alias name>`, e.g.

.README/rules/require-jsdoc.md

@@ -8,5 +8,9 @@ functions.
 |Context|`ArrowFunctionExpression`, `ClassDeclaration`, `FunctionDeclaration`, `FunctionExpression`|
 |Tags|N/A|
 |Settings|`exemptEmptyFunctions`|
+|Settings|`publicFunctionsOnly`|
+|Settings|`publicFunctionsOnly.exports`|
+|Settings|`publicFunctionsOnly.modules`|
+|Settings|`publicFunctionsOnly.browserEnv`|
 
 <!-- assertions requireJsdoc -->