Fix doubling attrs in NcPopover and improve docs

[ShGKme]

A problem

NcPopover is a wrapper around floating-vue's Dropdown component. It proxies all attrs and listeners to the wrapped Dropdown. It allows setting any Dropdown's props for customization.

But Vue inherits all attrs on the root node by default. It makes all attrs, passed as Dropdown prop, set as HTML attrs of root div.

Expected behavior with the Dropdown props

Actual behavior

The solution

This PR adds the required inheritAttrs: false.

ESLint rule helping with this problem: https://eslint.vuejs.org/rules/no-duplicate-attr-inheritance.html

Docs improvements

• Add an example with passing props to the Dropdown
  
• Fix Popover positions in docs
  • Before:
    
  • After:
    
• Fix typos in docs

See commits for details 🦖