Swap screenshots

episodes/07-github.md

@@ -80,7 +80,7 @@ GitHub repository a [remote](../learners/reference.md#remote) for the local repo
 The home page of the repository on GitHub includes the URL string we need to
 identify it:
 
-![](fig/github-find-repo-string.png){alt='Clicking the "Copy to Clipboard" button on GitHub to obtain the repository\'s URL'}
+![](fig/github-change-repo-string.png){alt='A screenshot showing that clicking on "SSH" will make GitHub provide the SSH URL for a repository instead of the HTTPS URL'}
 
 Click on the 'SSH' link to change the [protocol](../learners/reference.md#protocol) from HTTPS to SSH.
 
@@ -95,7 +95,7 @@ minimum level for GitHub.
 
 ::::::::::::::::::::::::::::::::::::::::::::::::::
 
-![](fig/github-change-repo-string.png){alt='A screenshot showing that clicking on "SSH" will make GitHub provide the SSH URL for a repository instead of the HTTPS URL'}
+![](fig/github-find-repo-string.png){alt='Clicking the "Copy to Clipboard" button on GitHub to obtain the repository\'s URL'}
 
 Copy that URL from the browser, go into the local `planets` repository, and run
 this command: