Update node descriptions in Core Node Models library

[hwahlstrom]

Purpose

Updating Core Node Models library node descriptions to adhere to node description content pattern.

Declarations

Check these if you believe they are true

• The codebase is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.
• This PR modifies some build requirements and the readme is updated

Release Notes

Updated descriptions for several nodes in the Core Node Models library to improve clarity and consistency.

Reviewers

@Amoursol

FYIs

[QilongTang]

LGTM but usually the designer files are updated as well. Did you edit using a regular editor instead of visual studio? But I think the file will be updated build time..

[QilongTang]

Two regressions found, must be some tests depending on validation of node descriptions:
Test Result (2 failures / DynamoCoreWpfTests.PreviewBubbleTests.Watch_ColorRange
Dynamo.Tests.SerializationTests.NodeDescriptionDeserilizationTest

Working on the fix