Remove confusion on where the Slack tab lives

As #144 and #138 shows, there is some confusion on where the actual tab is located. Some try to look at the Project and Build configuration setting pages that live under the main Administration category, which is wrong.

README.md

@@ -31,7 +31,7 @@ Once you have installed the plugin and restarted head on over to the Admin page
 
 ## Usage
 
-From the Slack tab on the Project or Build Configuration page, add a new Slack Notification and you're away!
+From the Slack tab on the project or build page (_not_ the Build Configuration Settings page), add a new Slack Notification and you're away!
 
 ![Sample Build Configuration](https://raw.github.com/petegoo/tcSlackBuildNotifier/master/docs/build-slack-config.png)
 
@@ -51,4 +51,4 @@ In order to test the plugin simply run the following command with java and mvn i
 
 By default it will install TeamCity in the version listed in the property in the root `pom.xml`. However you can overwrite this setting by using the `-DteamcityVersion=10.0` switch.
 
-Other available commands can be found [here](https://github.com/JetBrains/teamcity-sdk-maven-plugin).
+Other available commands can be found [here](https://github.com/JetBrains/teamcity-sdk-maven-plugin).