Fix details in Notifications list (#154)

* Fix columns on plain text

* Remove first column with version

* Change column order between Action and Component

* Add Component name in all the missing cells

* Rename Component to Feature in the table header

* Change columns' sizes

* Convert clarifications of 'if enabled' to footnotes

* Fix columns on plain text

* Reuse footnotes

* Fix columns on plain text

* Fix description of the table

* Change 'Affected user' column order and add clarification

* Fix grammar

Suggested on code review

Co-authored-by: Ruth Cheesley <ruth.cheesley@acquia.com>

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Co-authored-by: Ruth Cheesley <ruth.cheesley@acquia.com>

Author: andreslucena