Show constructor signature in hover information

[chriskriel]

When hovering over a method the hover information / tool-tip correctly shows the method signature. However for a constructor it incorrectly (in my opinion) shows class information and not the signature.

The only why to see the constructor's signature is to hover over a numeric argument to the constructor, which is not always available.

[chriskriel]

To be more clear, said "numeric argument" must be a constant, otherwise the tool-tip shows the variable declaration.

[Achal1607]

PR raised in Netbeans: apache/netbeans#7654