Merge pull request #737 from wturrell/patch-typos-1.9-develop

Fix typos, make minor phrasing improvements

installation/upgrade.html

@@ -67,7 +67,7 @@ <h4 id="plain">I just downloaded and installed the zip file</h4>
 				from the root of your application folder structure.
 			</p>
 			<p>
-				If have to upgrade from an earlier version, you have to manually remove the following folders:
+				If you have to upgrade from an earlier version, you must manually remove the following folders:
 <pre class="cli"><code>$ rm -rf fuel/core/ docs/
 $ rm -rf fuel/packages/auth/ fuel/packages/email/ fuel/packages/oil/
 $ rm -rf fuel/packages/orm/ fuel/packages/parser/ fuel/vendor/
@@ -80,10 +80,10 @@ <h4 id="plain">I just downloaded and installed the zip file</h4>
 			<h4 id="own_git">My project is in its own repository, including the framework files</h4>
 			<p>
 				Use the same procedure. Download the zip, and replace the files. Having them in a repository
-				gives you the benefit though to see the diff's, which makes it easier to work with the changelog
+				gives you the benefit though to see the diffs, which makes it easier to work with the changelog
 				to make the required modifications your application (if needed).
 			</p>
-			<p class="note"><strong>Note</strong> that if you (still) use SubVersion, pay attention to the hidden svn directories in each folder. Don't delete them when replacing the files!</p>
+			<p class="note"><strong>Note</strong> that if you (still) use SubVersion, pay attention to the hidden `.svn` directories in each folder. Don't delete them when replacing the files!</p>
 
 			<h4 id="git_with_subs">My project is in its own repository, I use submodules for the FuelPHP repositories</h4>
 			<p>