docs(require-returns, require-returns-check): indicate that these will report if multiple returns tags are present

Author: brettz9

.README/rules/require-returns-check.md

@@ -2,6 +2,8 @@
 
 Checks if the return expression exists in function body and in the comment.
 
+Will also report if multiple `@returns` tags are present.
+
 |||
 |---|---|
 |Context|`ArrowFunctionExpression`, `FunctionDeclaration`, `FunctionExpression`|

.README/rules/require-returns.md

@@ -2,6 +2,8 @@
 
 Requires returns are documented.
 
+Will also report if multiple `@returns` tags are present.
+
 #### Options
 
 - `exemptedBy` - Array of tags (e.g., `['type']`) whose presence on the document