docs(require-returns-check): update docs

Author: chiawendt

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

@@ -1,6 +1,6 @@
 ### `require-returns-check`
 
-Checks if the return expression exists in function body and in the comment.
+Requires a return statement in function body if a `@returns` tag is specified in jsdoc comment.
 
 Will also report if multiple `@returns` tags are present.
 

README.md

@@ -6320,7 +6320,7 @@ function assign({name, department}) {
 <a name="eslint-plugin-jsdoc-rules-require-returns-check"></a>
 ### <code>require-returns-check</code>
 
-Checks if the return expression exists in function body and in the comment.
+Requires a return statement in function body if a `@returns` tag is specified in jsdoc comment.
 
 Will also report if multiple `@returns` tags are present.