Feature/tinymce5update 3 releases 6 to 5.10 (#2315)

* fix links in Changelog

* fix links in -> Release -> Upcoming changes for TinyMCE 6

* fix links in -> Release -> TinyMCE 5.10.2

* fix links in -> Release -> TinyMCE 5.10.1

* fix links in -> Release -> TinyMCE 5.10

* add missing backticks

* fix link in partials/misc/releasenotes_for_stable.adoc

* fix `line-through` syntax

* change anchors syntax

* fix syntax and indentation

* fix link

Author: lorenzo-pomili

_new_content_templates/blank_releasenotes.adoc

@@ -115,6 +115,7 @@ Add description here.
 
 For information on using premium skins and icon packs, see: link:{baseurl}/enterprise/premium-skins-and-icon-packs/[Premium Skins and Icon Packs].
 
+[[accompanyingpremiumself-hostedserver-sidecomponentchanges]]
 == Accompanying Premium self-hosted server-side component changes
 
 The {productname} vnumtxt release includes accompanying changes affecting the {productname} *self-hosted* services for the following plugins: