Spelling correction in Q121

Author: jaisayush

README.md

@@ -2225,7 +2225,7 @@ You can download the PDF and Epub version of this repository from the latest run
    **[⬆ Back to Top](#table-of-contents)**
 
  121. ### What is a builder?
-      A builder function ia a function that uses the `Architect API` to perform a complex process such as "build" or "test". The builder code is defined in an npm package. For example, BrowserBuilder runs a webpack build for a browser target and KarmaBuilder starts the Karma server and runs a webpack build for unit tests.
+      A builder function is a function that uses the `Architect API` to perform a complex process such as "build" or "test". The builder code is defined in an npm package. For example, BrowserBuilder runs a webpack build for a browser target and KarmaBuilder starts the Karma server and runs a webpack build for unit tests.
 
    **[⬆ Back to Top](#table-of-contents)**
 
@@ -4594,4 +4594,4 @@ You can download the PDF and Epub version of this repository from the latest run
 274. ### What is content projection?
      Content projection is a pattern in which you insert, or project, the content you want to use inside another component.
 275. ### What is ng-content and its purpose?
-     The ng-content is used to insert the content dynamically inside the component that helps to increase component reusability. 
+     The ng-content is used to insert the content dynamically inside the component that helps to increase component reusability.