Updating some Request handling topics

[tatang26]

The change list is these:

Routing.

• Multiple movements throughout the section

Actions:

• Changes for Generating Actions section

Resources

• Updates on code blocks

Context

• Updating code blocks

Binding

• Mapped Content Type titles were updated

Middlewares

• Some example codes were updated and I fixed some elements

Also I added a marging bottom to all of code in li in order to have some space between background colors

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