Modifications to the RiverFlowDynamics notebook

[mcflugen]

Description

@angelmons, this pull request makes some changes to your RiverFlowDynamics notebook. The changes fall into the following categories:

• Fix typos
• Remov header cells to match other notebooks
• Follow the latest Landlab best practices (e.g. esri_ascii.load rather than read_esri_ascii)
• Clean up some of the loops to, I hope, make them more clear

Checklist - did you ...

• Add a news fragment file entry if necessary?
• Add / update tests if necessary?
• Add new / update outdated documentation?
• All tests have passed?
• Formatted code with black?
• Removed lint reported by flake8?
• Sucessful documentation built? (if documentation added or modified)

[coveralls]

Pull Request Test Coverage Report for Build 11429622734

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 4 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.004%) to 73.234%

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Files with Coverage Reduction	New Missed Lines	%
.nox/test-3-12/lib/python3.12/site-packages/landlab/components/lateral_erosion/node_finder.py	1	70.54%
.nox/test-3-10/lib/python3.10/site-packages/landlab/components/lateral_erosion/node_finder.py	3	71.43%

Totals
Change from base Build 11406556441:	0.004%
Covered Lines:	54928
Relevant Lines:	75003

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💛 - Coveralls