[Docs] Create symlink for missing releaseNotes18100.html
[Docs] Create symlink for missing releaseNotes18100.html

This is a workaround since this file is not available yet
the release notification was sent with it.

Resolves: LE-11666
Change-Id: Icaecf30e7b38785078e61bb47a81447861fc7687

legatoproject/legato-docs,legatoproject/legato-docs,legatoproject/legato-docs