message: docs: fix minor grammar mistakes in What is Angular topic
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diff: @@ -144,7 +144,7 @@ The Angular CLI is the fastest, easiest, and recommended way to develop Angular
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  <td><a href="cli/serve">ng serve</a></td>
  -<td>Builds and serves your application, rebuilding on file changes</td>
  +<td>Builds and serves your application, rebuilding on file changes.</td>
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  <td><a href="cli/generate">ng generate</a></td>
  