docs(parser): fix effect->affect in readme (typescript-eslint#1344)

Author: lxe

packages/parser/README.md

@@ -42,7 +42,7 @@ The following additional configuration options are available by specifying them
 
 - **`ecmaFeatures.jsx`** - default `false`. Enable parsing JSX when `true`. More details can be found [here](https://www.typescriptlang.org/docs/handbook/jsx.html).
 
-  NOTE: this setting does not effect known file types (.js, .jsx, .ts, .tsx, .json) because the typescript compiler has its own internal handling for known file extensions. The exact behaviour is as follows:
+  NOTE: this setting does not affect known file types (.js, .jsx, .ts, .tsx, .json) because the typescript compiler has its own internal handling for known file extensions. The exact behaviour is as follows:
 
   - if `parserOptions.project` is _not_ provided:
     - `.js`, `.jsx`, `.tsx` files are parsed as if this is true.