en/index: s/a email/an email/

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@@ -225,7 +225,7 @@ When it is done, install the program by entering the following code in Terminal:
 
 <dl>
 <dt>Get GnuPG by downloading GPG4Win</dt>
-<dd><p><a href="https://www.gpg4win.org/">GPG4Win</a> is a email and file encryption software package that includes GnuPG. Download and install the latest version, choosing default options whenever asked. After it's installed, you can close any windows that it creates.</p>
+<dd><p><a href="https://www.gpg4win.org/">GPG4Win</a> is an email and file encryption software package that includes GnuPG. Download and install the latest version, choosing default options whenever asked. After it's installed, you can close any windows that it creates.</p>
 
 <p class="notes">To follow the rest of the steps in this guide, you'll use the program called "PowerShell", which is a program you'll see elsewhere referred to as a "terminal." This allows you to operate your computer using the command line.</p>
 </dd>