Updated c++ and python shape examples after feedback.

[cgalvan]

Made some improvements to the Shape Example tools after feedback:

• Added introduction text and link to the actual tutorial
• Modified placeholder text for entity name entry and added tooltip to suffix checkbox
• Added editable combo box example to set the scale on the entity

For just the python example, brought in some generic changes that were made to the base PythonToolGem template.

Signed-off-by: Chris Galvan chgalvan@amazon.com