Correct a typo in oob1.html

Possibly a typo but please ignore if it is not.
This is a prep of my Japanese translation.

Signed-off-by: Muuhh IKEDA <[email protected]>

Author: Muuhh-CTJ

docs/labs/oob1.html

@@ -68,7 +68,7 @@ <h2>Background</h2>
 <p>
 <h2>Task Information</h2>
 <p>
-We're going re-create the fix in OpenSSF for the Heartbleed vulnerability
+We're going re-create the fix in OpenSSL for the Heartbleed vulnerability
 by modifying function <tt>dtls1_process_heartbeat</tt>.
 <p>
 At this point in the code, the construct