Fixed user guide internal & external links to resolve problems reported by sphinx "make linkcheck"
Signed-off-by:Master Yoda <jim_parry@bcit.ca>
diff --git a/user_guide_src/source/libraries/encryption.rst b/user_guide_src/source/libraries/encryption.rst
index 0c34760..599be4d 100644
--- a/user_guide_src/source/libraries/encryption.rst
+++ b/user_guide_src/source/libraries/encryption.rst
@@ -482,7 +482,7 @@
MD5 or SHA1 is that they are no longer considered secure enough
and as such, we don't want to encourage their usage.
If you absolutely need to use them, it is easy to do so via PHP's
-native `hash_hmac() <http://php.net/hash_hmac()>`_ function.
+native `hash_hmac() <http://php.net/manual/en/function.hash-hmac.php>`_ function.
Stronger algorithms of course will be added in the future as they
appear and become widely available.