Update http_cache.rst

Explained how the parameters are passed to the controller - named parameters
Clarifying a bit more that you're passing variables into your controller
minor #4338 ESI Variable Details Continuation (Farkie, weaverryan)

This PR was merged into the 2.3 branch.

Discussion
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ESI Variable Details Continuation

This continues #4098.

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | no
| Applies to    | 2.3+
| Fixed tickets | n/a

Thanks!

Commits
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ded7577 Clarifying a bit more that you're passing variables into your controller
5877d02 Update http_cache.rst
Added Composer installation tip
feature #4099 Composer installation verbosity tip (dannykopping)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #4099).

Discussion
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Composer installation verbosity tip

Added installation verbosity tip, for users with slow internet connections.

With love from slow South Africa :earth_africa:

Commits
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f8d69d4 Added Composer installation tip
[#4099] Adding an extra tip
Merge branch '2.3' into 2.5

* 2.3:
  [#4099] Adding an extra tip
  Added Composer installation tip
  Clarifying a bit more that you're passing variables into your controller
  Update http_cache.rst

Conflicts:
	cookbook/workflow/new_project_git.rst
[#4099] Trying to get the markup just right
Merge branch '2.3' into 2.5

* 2.3:
  [#4099] Trying to get the markup just right