Add examples and improve help to show stdin usage with ddev import-db, fixes #1690 #1859
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The Problem/Issue/Bug:
#1690 (ddev import-db accepting stdin) was long ago resolved, but the ability to accept stdin was never added to the
ddev import-db
help.How this PR Solves The Problem:
Adds it to help.
Manual Testing Instructions:
Automated Testing Overview:
Related Issue Link(s):
Release/Deployment notes: