[issue8218] Fix typos and phrasing in the Web servers howto

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

There's also an invalid link to an image just after the title "The low-level view":
-.. .. image:: http.png
+.. image:: http.png

The image is not there though, and in r66294 only the document has been added.

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