Node help documents 10 nodes (#3410)

DSRevitNodesUI.SpacingRuleLayouts
Revit.AnalysisDisplay.VectorAnalysisDisplay.ByViewPointsAndVectorValues
Revit.Elements.Dimension.ByReferences
Revit.Elements.GroupType.ByTypeId
Revit.Elements.PathOfTravel.LongestOfShortestExitPaths
Revit.Elements.SpecType.ByTypeId
Revit.Transaction.Transaction.Start
UnitsUI.Quantities
UnitsUI.Symbols
UnitsUI.Units


Please Note:
1. Before submitting the PR, please review [How to Contribute to
Dynamo](https://github.com/DynamoDS/Dynamo/blob/master/CONTRIBUTING.md)
2. Dynamo Team will meet 1x a month to review PRs found on Github
(Issues will be handled separately)
3. PRs will be reviewed from oldest to newest
4. If a reviewed PR requires changes by the owner, the owner of the PR
has 30 days to respond. If the PR has seen no activity by the next
session, it will be either closed by the team or depending on its
utility will be taken over by someone on the team
5. PRs should use either Dynamo's default PR template or [one of these
other template
options](https://github.com/DynamoDS/Dynamo/wiki/Choosing-a-Pull-Request-Template)
in order to be considered for review.
6. PRs that do not have one of the Dynamo PR templates completely filled
out with all declarations satisfied will not be reviewed by the Dynamo
team.
7. PRs made to the `DynamoRevit` repo will need to be cherry-picked into
all the DynamoRevit Release branches that Dynamo supports. Contributors
will be responsible for cherry-picking their reviewed commits to the
other branches after a `LGTM` label is added to the PR.

### Purpose

(FILL ME IN) This section describes why this PR is here. Usually it
would include a reference
to the tracking task that it is part or all of the solution for.

### Declarations

Check these if you believe they are true

- [ ] The code base is in a better state after this PR
- [ ] Is documented according to the
[standards](https://github.com/DynamoDS/Dynamo/wiki/Coding-Standards)
- [ ] The level of testing this PR includes is appropriate
- [ ] User facing strings, if any, are extracted into `*.resx` files
- [ ] Snapshot of UI changes, if any.

### Reviewers

(FILL ME IN) Reviewer 1  (If possible, assign the Reviewer for the PR)

(FILL ME IN, optional) Any additional notes to reviewers or testers.

### FYIs

(FILL ME IN, Optional) Names of anyone else you wish to be notified of

---------

Co-authored-by: john pierson <john.pierson@autodesk.com>
Co-authored-by: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

Author: 3 people

doc/distrib/NodeHelpFiles/DSRevitNodesUI.SpacingRuleLayouts.dyn

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+      "Replication": "Disabled",
+      "Description": "A spacing rule layout for calculating divided paths."
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+          "Id": "d3b615cdf66641c98a4a24efddd6f8aa",
+          "Name": "value",
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