Clarify Import instructions for sql package

[peterreg]

User is asking how to import sql package and references the following page:
https://docs.influxdata.com/flux/v0.x/stdlib/sql/

The sql import instructions are there at the top of the page but maybe we need to add more clarification in the text. Something like "To import the sql package use the following command..."

New user feedback!
Page: https://docs.influxdata.com/flux/v0.x/stdlib/sql/
Feedback: Where and how to import