fix: typos and grammar in docs/blog/articles/getting-started-blog-p0.md

[codeEvolveZenith345]

Improves readability and professionalism of the blog post. All changes are minor grammatical corrections with no content modifications.

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[evankanderson]

/lgtm
/approve

Thanks for doing this! One small quibble -- when you've either addressed it or decided that you disagree, you can /hold cancel to have this merge.

/hold

[codeEvolveZenith345]

/hold cancel

[codeEvolveZenith345]

/lgtm
/approve

[knative-prow]

@codeEvolveZenith345: you cannot LGTM your own PR.

In response to this:

/lgtm
/approve

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[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: codeEvolveZenith345, evankanderson

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[evankanderson]

/lgtm