docs: fixes the changelog commits format

Author: thekiba

scripts/templates/changelog-feat.ejs

@@ -12,7 +12,7 @@
     %>
 <a href="https://github.com/angular/angular-cli/commit/<%= hash %>"><img
    align="top"
-   title="Bug Fix" src="https://img.shields.io/badge/<%= shortSha %>-feat-blue.svg" />
+   title="Feature" src="https://img.shields.io/badge/<%= shortSha %>-feat-blue.svg" />
 </a><%
   } %>
   </td>

scripts/templates/changelog-fix.ejs

@@ -12,7 +12,7 @@
     %>
 <a href="https://github.com/angular/angular-cli/commit/<%= hash %>"><img
    align="top"
-   title="Feature" src="https://img.shields.io/badge/<%= shortSha %>-fix-green.svg" />
+   title="Bug Fix" src="https://img.shields.io/badge/<%= shortSha %>-fix-green.svg" />
 </a><%
   } %>
   </td>