add image descriptions to remaining docs

docs/contributing/cloning-a-repository-to-visual-studio.md

@@ -5,15 +5,15 @@ After you provide your GitHub or GitHub Enterprise credentials to GitHub for Vis
 1. Open **Team Explorer** by clicking on its tab next to *Solution Explorer*, or via the *View* menu.
 2. Click the **Manage Connections** toolbar button.
 
-![image](images/manage-connections.png)
+![Location of the manage connections toolbar button in Team Explorer](images/manage-connections.png)
 
 3. Next to the account you want to clone from, click **Clone**.
 
-![image](images/clone-link.png)
+![Clone button in the GitHub section of Team Explorer](images/clone-link.png)
 
 4. In the list of repositories, click the repository you'd like to clone.
 
-![image](images/clone-dialog.png)
+![List of GitHub repositories that can be cloned inside a dialog](images/clone-dialog.png)
 
 5. If desired, change the local path where the repository will be cloned into, or leave the default as-is. Click **Clone**.
 6. In Team Explorer, under the list of repositories, locate the repository and double-click to open the project in Visual Studio.

docs/contributing/creating-a-pull-request.md

@@ -2,9 +2,9 @@
 
 1. Open a solution in a GitHub repository.
 2. Open **Team Explorer** and click the **Pull Requests** button to open the **GitHub** pane.
-![Pull Requests](images/pull-requests-button2.png)
+![Location of the pull requests button in the Team Explorer pane](images/pull-requests-button2.png)
 3. Click the **Create New** link above the list of pull requests for the repository.
 4. Select the target branch by clicking the link. If the current repository is a fork, then there will be two sets of branches in the dropdown - to submit a pull request upstream then select a branch with the `owner:` prefix of the upstream repository.
-![](images/pr-create.png)
+![The pull request creation form in the GitHub pane](images/pr-create.png)
 5. Enter a pull request title and an optional description.
 6. Click the **Create Pull Request** button.

docs/contributing/creating-an-empty-repository-from-visual-studio.md

@@ -6,15 +6,15 @@
 
 3. Click the **Manage Connections** toolbar button.
 
-   ![image](images/manage-connections.png)
+   ![The manage connections toolbar button in Team Explorer](images/manage-connections.png)
 
 4. Click the **Create** link next to the account you want to create the repository in.
 
-   ![image](images/create-link.png)
+   ![The create link in the Team Explorer pane](images/create-link.png)
 
 5. In the **Create a GitHub Repository** dialog, enter a name, description and local path for the repository.
 
-   ![image](images/create-dialog.png)
+    ![The create a GitHub repository dialog](images/create-dialog.png)
 
 6. Select a license for the repository.
 
@@ -24,4 +24,4 @@
 
 9. When the repository is created, click the **Create a new Project or Solution** link in Team Explorer to create a project or solution in the repository.
 
-![image](images/successful-creation-message.png)
+    ![Successful repository creation message at the top of the Team Explorer pane](images/successful-creation-message.png)

docs/contributing/creating-gists.md

@@ -10,11 +10,11 @@ GitHub for Visual Studio enables easy creation of gists directly from the Visual
 
 4. Right click and select **Create a GitHub Gist** from the **GitHub** submenu.
 
-   ![image](images/create-gist-menu.png)
+   ![Location of Create A GitHub Gist in the GitHub submenu](images/create-gist-menu.png)
 
 5. In the **Create a GitHub Gist** dialog, check that the filename is correct and optionally add a description.
 
-   ![image](images/create-gist-dialog.png)
+   ![GitHub Gist creation dialog window](images/create-gist-dialog.png)
 
 6. If you want the gist to be private, check the **Private Gist** checkbox.