feat: minor wording adjustments

Author: johannespfeiffer

src/main/resources/hudson/plugins/git/GitPublisher/config.jelly

@@ -65,7 +65,7 @@
                 checkUrl="'descriptorByName/GitPublisher/checkRemote?value='+escape(this.value)" />
           </f:entry>
           <f:entry field="rebaseBeforePush"
-                   title="${%Rebase Before Push}">
+                   title="${%Rebase before push}">
             <f:checkbox />
           </f:entry>
         </table>

src/test/java/hudson/plugins/git/GitPublisherTest.java

@@ -799,7 +799,7 @@ public boolean perform(AbstractBuild<?, ?> build, Launcher launcher, BuildListen
         remoteGit.commit("commitFile1", remoteGit.johnDoe, "Added a file commitFile1");
         remoteGit.git.checkout(headRev.getName()); // allow to push to this repo later
 
-        // checkout initial commit and create another head with our changes.
+        // commit onto the initial commit (creates a head with our changes later).
         workspaceGit.commit("commitFile2", remoteGit.johnDoe, "Added a file commitFile2");
 
         return true;