Update tooltip.md (#601)
Update tooltip.md (#601)

Corrected the code for the example to use events to open and close the tooltip.
quasarframework/quasar-framework.org,rstoenescu/quasar-site,rstoenescu/quasar-site,quasarframework/quasar-framework.org,rstoenescu/quasar-site,quasarframework/quasar-framework.org