Simplify and clarify the memory terminology article

[captainbrosset]

Rendered articles for review:

• Memory terminology: https://review.learn.microsoft.com/microsoft-edge/devtools-guide-chromium/memory-problems/memory-101?branch=pr-en-us-3033 [Before/Live]
• Record heap snapshots: https://review.learn.microsoft.com/microsoft-edge/devtools-guide-chromium/memory-problems/heap-snapshots?branch=pr-en-us-3033 [Before/Live]

These articles are a bit hard to understand, sometimes give information that's not really actionable for web developers, and could use an update.

AB#48649923

[mikehoffms]

1st-pass review of heap-snapshots.md
3rd-pass review of memory-101.md

[sethbrenith]

LGTM, just a few minor comments.

[mikehoffms]

Approved PR, per Writer/Editor reviews/revisions.

[learn-build-service-prod]

Learn Build status updates of commit dc711be:

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