docs: fix grammar mistakes

[Copilot]

Fixes 11 grammar mistakes scattered across documentation and code comments.

README.md

• "Do not follow/differentiate..." → "Does not follow/differentiate..." (indicative third-person in Limitations)
• "differs depends on" → "differs depending on"

Source files

• "descendent" → "descendant" (fs_tree_builder.rs, tree_builder.rs)
• "parsing a string to as" → "parsing a string as" (args/threads.rs)
• "visualize of the [tree]" → "visualize the [tree]" (visualizer/methods.rs)
• "cause problem" → "cause problems" (app.rs, app/overlapping_arguments.rs)
• "cheaper than reallocate" → "cheaper than reallocating" (app/overlapping_arguments.rs)
• "more than 1 elements" → "more than 1 element" (app/overlapping_arguments.rs)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>docs: fix grammar mistakes</issue_title>
<issue_description></issue_description>

<agent_instructions>Can you find all grammar mistakes in the documentation and comments in this code base?

Can you tell me how many there are?

Can you fix them?

Remember to run env DOC=true ./test.sh to test the documentation.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes docs: fix grammar mistakes #325

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[github-actions]

Performance Regression Reports

commit: dc3cb5e

There are no regressions.