Regression in Tooltip: content doesn't update after first show

Created by: astappiev

We are using a function to retrieve the content of the tooltip according to documentation.

But since bootstrap 5.1 it doesn't work anymore. It creates a tip element only once calling our function, but then after each new interaction (show-hide), it just reuses an existing tip element without updating its content.

The regression was created by this commit, because this.setContent() was removed from show() method.