Symbol change for information for tooltip in forms

It seems that in 3.7 onward the symbol for template elements (toolip symbol) has changed from * to ! which cause some confusions. These seems to be introduced by the new "element-..." mustache files. If there wasn't any specific reason for this change, I think having the symbol revert back to * is a more sensible as its a familiar symbol.

Example of the location in the code:

lib/form/templates/element-template.mustache: #advanced<abbr class="initialism text-info" title="#str}}advanced{{/str">!</abbr>/advanced