Amend Vue docs and showcases by colon (:) for Input Form

[mengbingguo]

Description

Having a colon at the end of the label is mandatory in the Fiori Guidelines (SAPUI5 renders that automatically). From reading the FD Vue docs, I don't know how I would achieve that. Also, the showcases need colon in input label by default to be Fiori-compliant.

Reproduction

SAPUI5:

Fundamental Vue:

Reference

Fiori Guidelines: https://experience.sap.com/fiori-design-web/form/#guidelines

At the end of the label, the form container automatically inserts a colon (:), which is triggered by the stylesheet. Do not write the colon manually in the label text.