[general] Update release-template.md notes. (#654)

* `[general]` Update `release-template.md` notes.

* Update release-template.md

* Update release-template.md

* Update release-template.md

* Update release-template.md

Author: bsastregx

release-template.md

@@ -30,11 +30,22 @@
 ## `Dos and don'ts`
 
 - How to document a change.
-
   - DO:
-
     - `[Accordion]` Improved the focus style for the accordion by @johnDoe in #number
 
   - DON'T:
     - `[mercury][accordion]` Improved the styles of the ch-accordion-render
 
+- Design Systems (year-month-day) title.
+  - DO:
+    - Apply the title on the _Release title_ input.
+
+  - DON'T:
+    - Apply the title in the _Realse notes_ section.
+
+- Breaking changes sub-titles.
+  - DO:
+    - For each package, include a subtitle, only if more that one package has breaking changes. (ie.: Mercury, and Unanimo).
+
+  - DON'T:
+    - Include a package subtitle, if only one package has breaking changes. (ie.: Mercury).