[DOC] Fix typos and enhance clarity in getting_started.md

[PoojasPatel013]

While working through the getting_started.md guide to familiarize myself with the project, I encountered a few typos, a formatting issue.

Detailed Changes

1. Fix Garbled Text in "Segmentation" Description (Line 34)

Issue: The description for the Segmentation module was unclear and contained the phrase "sofind areas...", which appears to be a text-editor artifact or copy-paste error.
Fix: Replaced the confusing sentence with a precise definition.

Before: "...sofind areas..."
After: "...series into regions that are dissimilar to each other."

2. Grammar Correction (Line 40)

Issue: A redundant article was present in the sentence structure.
Fix: Removed the extra "a".

Before: "...where a either a single series..."
After: "...where either a single series..."

3. List Indentation Fix (Line 45)

Issue: The "Networks" list item was not indented correctly, causing it to break the visual hierarchy of the module list.
Fix: Adjusted whitespace to align "Networks" with the preceding and succeeding list items.

4. Spelling Correction (Line 203)

Issue: The word "multivariate" was misspelled.
Fix: Corrected spelling.

Before: "...mutlivariate..."
After: "...multivariate..."

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[MatthewMiddlehurst]

Thanks, agree with the changes and fixes

[MatthewMiddlehurst]

@all-contributors add @PoojasPatel013 for docs

[allcontributors]

@MatthewMiddlehurst

I've put up a pull request to add @PoojasPatel013! 🎉