Updated openstack/openstack
Project: openstack/swift  33a58d09ad3a392794a02bd502c7ec43f53a72fb
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Alphabetized items under "Middleware" in source documentation

I alphabetized the items under "Middleware" in the source documentation
to make them easier to locate.

Change-Id: I3a0108c89d16ef07b7623dda518b3096c2686002