Make isClass optional

[sarahsonder]

Proposed Changes

• Updated documentation, tests, and examples to reflect the isClass attribute being optional and set to false by default. Previously isClass was manually set to false - this is no longer necessary and simplifies the user input into MemoryViz.
• Fixed some minor typos in 02-object_structure.md, such as standardizing the spelling of stack frame.
• Added indentation to the first two examples in 02-object_structure.md so that users don't need to screen horizontally to see the full example.

Type of Change

Type	Applies?
🚨 Breaking change (fix or feature that would cause existing functionality to change)
✨ New feature (non-breaking change that adds functionality)
🐛 Bug fix (non-breaking change that fixes an issue)
🎨 User interface change (change to user interface; provide screenshots)
♻️ Refactoring (internal change to codebase, without changing functionality)	X
🚦 Test update (change that only adds or modifies tests)	X
📚 Documentation update (change that only updates documentation)	X
📦 Dependency update (change that updates a dependency)
🔧 Internal (change that only affects developers or continuous integration)

Checklist

Before opening your pull request:

• I have performed a self-review of my changes.
  • Check that all changed files included in this pull request are intentional changes.
  • Check that all changes are relevant to the purpose of this pull request, as described above.
• I have updated the project documentation, if applicable.
  • This is required for new features.
• I have updated the project Changelog (this is required for all changes).

After opening your pull request:

• I have verified that the CI tests have passed.
• I have reviewed the test coverage changes reported by Coveralls.
• I have requested a review from a project maintainer.

[coveralls]

Pull Request Test Coverage Report for Build 9237530555

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 86.781%

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Totals
Change from base Build 9230691981:	0.0%
Covered Lines:	380
Relevant Lines:	423

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💛 - Coveralls