docs: fix 15 typos in blog posts

[Avicennasis]

Summary

Fix 15 typos and grammar issues across 7 blog posts:

• _posts/2020-03-24-introducing-kafka-player.md: look → looks (subject-verb agreement)
• _posts/2018-04-18-bandits-for-the-win.md: "diversity of rows are" → "is" (subject-verb agreement); "cannot understate" → "cannot overstate" (malapropism)
• _posts/2019-12-23-data-eng-in-2020.md: axis → axes (plural); "need to substantial" → "need to make substantial" (missing verb); added missing period at end of article
• _posts/2020-09-15-integrating-databricks-and-datadog.md: applicatin → application; "To initializing" → "To initialize"; emtrics → metrics
• _posts/2020-03-02-breaking-up-the-dag-repo.md: "DAGs to present" → "to be present"; builtin → built-in; "is setup to" → "is set up to"
• _posts/2019-12-30-migrating-kafka-to-aws.md: deloyment → deployment
• _posts/2019-08-28-real-time-data-platform.md: "Editors note" → "Editor's note"; "made made" → "made" (duplicate word)

No functional changes — comments and documentation only.

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Note

Low Risk
Markdown documentation edits only; no application code, config, or runtime behavior changes.

Overview
Corrects 15 spelling and grammar issues across seven engineering blog posts under _posts/, with no content or structural changes beyond wording.

Fixes include subject–verb agreement (looks, is important), the malapropism cannot overstate, plural axes, missing make and a closing period in the data-eng post, typos (deployment, application, metrics, built-in), phrasing (to be present, set up, To initialize), Editor's note, and a duplicated made.

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