Fixing wrong parameter name in redirecting in config
add note for the HTML5 date format
[forms] Remove tip for skipping validation group section
[cookbook/form/dynamic_form_modification] Fix sample code for dynamic generation of submitted forms (3rd section)
Update installation.rst

typo in cookbook/bundle/installation
[Components][Config][Definition] Fix code sample
Added hint about modifying an unmapped form field
Fixed typos
Updated typo
Updated parameter
[#2949] Trimming whitespace
Merge pull request #2975 from xabbuh/issue-2973

Note about custom formats and the HTML5 date type
[#2975] Taking the talk about the HTML date field further by updating default values and tweaking related details
Merge pull request #2976 from michelsalib/patch-1

Fixing wrong parameter name in redirecting in config
Merge pull request #2981 from bicpi/remove_tip_for_validation_groups

[forms] Remove tip for skipping validation group section
Merge pull request #2982 from bicpi/fix_cookbook_dynamic_form_modfication_example

[cookbook/form/dynamic_form_modification] Fix sample code
Merge branch '2.0' into 2.1
Merge branch '2.1' into 2.2
Merge pull request #2984 from peterkokot/2.1

Update installation.rst
Merge branch '2.1' into 2.2