web/standards: use attribute naming scheme for attributes
## What
Renamed the 'inputHint' attribute to 'input-hint', because it is an attribute, not a property.
Properties are camelCased, but attributes are kebab-cased.
Updated all instances where this appears with the usual magic:
```
$ perl -pi.bak -e 's/inputHint="code"/input-hint="code"/' $(rg -l 'inputHint="code"')
```
This fix is in preparation for both the Patternfly 5 project and the Schema-Driven Forms project.
* Revision: You almost certainly do NOT want every field to be reflected. Booleans are okay, especially for fields that may be changed internally but need to be read by screen-readers, sunch as 'hidden' or 'invalid'. But if a field is a string or a number and has a default value, you do not want it to be reflected.
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