docs(no-unsafe-first): when not to use it

Author: JasonWeinzierl

docs/rules/no-unsafe-first.md

@@ -26,3 +26,15 @@ This rule accepts a single option which is an object with an `observable` proper
   ]
 }
 ```
+
+## When Not To Use It
+
+If you don't use a library with effects and epics (e.g. NgRx or redux-observable),
+then you don't need this rule.
+
+Type checked lint rules are more powerful than traditional lint rules, but also require configuring type checked linting.
+
+## Resources
+
+- [Rule source](https://github.com/JasonWeinzierl/eslint-plugin-rxjs-x/blob/main/src/rules/no-unsafe-first.ts)
+- [Test source](https://github.com/JasonWeinzierl/eslint-plugin-rxjs-x/blob/main/tests/rules/no-unsafe-first.test.ts)