Add docs for accessing behaviors.

Refs cakephp/cakephp#5264
Add context comments to table docs.
[fr] follow 73843ac - add docs for accessing behaviors
[fr] follow fd5bbda
Add docs for testing AuthComponent & more integration testing docs in
general.
Note the absence of plugin prefixes.
complete tranlation
[fr] issue-2047
[fr] correct mistakes
Merge pull request #2055 from cakephp/issue-2047

Add docs for testing AuthComponent & more integration testing docs in general.
Merge pull request #2062 from antograssiot/3.0

Add namespace to Hash + french updates/typos
Fix incorrect usage in the docs.
Merge pull request #2051 from cakephp/add-context

Add context comments to table docs.
Merge pull request #2049 from cakephp/behavior-docs

Add docs for accessing behaviors.
update docs example for integration test
expand quickstart guide a bit more, to show where to put authorize
Merge pull request #2066 from ceeram/3.0-quickstart

expand quickstart guide a bit more, to show where to put authorize
[fr] follow 2066
Fix small typos.
Merge pull request #2078 from Cayan/patch-2

Fix small typos.