Fix the header name and typo.

README.md

@@ -62,9 +62,9 @@ You can login as an admin user with username `root` and password `5iveL!fe`.
 ### Common installation problems
-#### Unable to install using apt/yum repository
-When trying to install GitLab using the apt or yum repo if you receive an error similar to:
+#### Apt error 'The requested URL returned error: 403'
+When trying to install GitLab using the apt repo if you receive an error similar to:
 ```bash
 W: Failed to fetch https://packages.gitlab.com/gitlab/gitlab-ce/DISTRO/dists/CODENAME/main/source/Sources  The requested URL returned error: 403
@@ -78,7 +78,7 @@ Add the following line to apt-cacher-ng config(eg. in  `/etc/apt-cacher-ng/acng.
 PassThroughPattern: (packages\.gitlab\.com|packages-gitlab-com\.s3\.amazonaws\.com)
 ```
-Read more about `apt-cacher-ng` and the reasons why this change is need [on the packagecloud blog](http://blog.packagecloud.io/eng/2015/05/05/using-apt-cacher-ng-with-ssl-tls/).
+Read more about `apt-cacher-ng` and the reasons why this change is needed [on the packagecloud blog](http://blog.packagecloud.io/eng/2015/05/05/using-apt-cacher-ng-with-ssl-tls/).
 #### GitLab is unreachable in my browser