Minor grammatical correction
Cookbook article about custom route loaders
Processed feedback by @lazyhammer and @WouterJ
[W] components/options_resolver
[C] components/options_resolver
[R] components/options_resolver

- Removed uses of 'we'
[R] components/options_resolver

- Review by @stof
Added use cases and explained the loader resolver
Added some references to bundles using route loaders
add note on service parameters regarding ScopeWideningInjectionException
fix backticks with double backticks
Add documentation to Collection constraint showing usage of Required
and Optional classes.
remove unnecessary text
Fix missing line breaks and heading line length.
Change complete to completely.
Added configuration-block:: annotation to example section.
Wrap all yml strings containing "@" with quotes in order to render the
syntax highlighting correctly
Wrap all YAML strings starting with "@" with quotes

Without quotes, the parser doesn't render the syntax highlighting correctly
Issue #2378. Minor additions. Implemented suggestions by WouterJ.
Wrap all YAML parameter % uses with quotes

Without quotes, the parser doesn't render the syntax highlighting correctly