message: Fix typo in doc/https_support.html
diff: @@ -290,7 +290,7 @@ under the License.
  effect and the protocol is changed in front of the PageSpeed-enabled server,
  a mismatch may arise when performing loopback fetches, leading up to fetching
  failures. Explicitly authorizing the domain used to fetch resources will
  - resolve this problem, because doing so allows the oopback fetching mechanism
  + resolve this problem, because doing so allows the loopback fetching mechanism
  to be bypassed.
  </p>
  