Add double quote.

Change-Id: Ie0ac9f3906707a699159ed1cce6c26d40c02fc44
diff --git a/_faq/pgpkeys.markdown b/_faq/pgpkeys.markdown
index d32ad96..78e9b0a 100644
--- a/_faq/pgpkeys.markdown
+++ b/_faq/pgpkeys.markdown
@@ -9,7 +9,7 @@
 To verify a file, you will need to install our <a href="https://dl.twrp.me/public.asc">public key</a> into
 your keyring. The public key is also listed on each device's download page. Please download the key to a new file.
 When you click on the page, you will see a link for the PGP verification file as
-"Download PGP Signature twrp-device-version.type.asc. This file is in binary format and is created using our
+"Download PGP Signature twrp-device-version.type.asc". This file is in binary format and is created using our
 private key the first time the download page is created for the file. You can then perform
 the following steps to verify repudiation (Linux steps only):