Lab 18 - all tags must all be in all lowercase

[msftnutta]

Lab/Demo: 18

Task: Add and tag images

Step: 5

Description of issue

Repro steps:

At step 5

When the region surrounds the object, add a new tag with the appropriate object type (apple, banana, or orange) as shown here:

need to emphasize using all tags in all lowercase, otherwise, it won't work when executing the training from the code.