Add note about buffering in StreamedResponse.
Documenting the non-blocking features of the Process component
[#1842] Heavily reworking the dynamic for modification chapter - there is still quite a bit left to do
[#2417] Fixing line breaks thanks to @WouterJ
Merge pull request #2417 from symfony/dynamic-forms

Refactor: Dynamic forms cookbook entry
Merge pull request #2422 from pvolok/note_in_streamedresponse

Add note about buffering in StreamedResponse.
[#2422] Proofreading notes on output buffering and StreamedResponse
Facelift of book/controller.rst issue #2377
Update installation.rst

Added some symlink support information.
Merge pull request #2430 from Sgoettschkes/issue1185

Documenting the non-blocking features of the Process component
Merge remote-tracking branch 'origin/2.1' into 2.1
Fixing language
Merge branch '2.1' into 2.2

Conflicts:
	components/http_foundation/introduction.rst
	cookbook/form/dynamic_form_modification.rst