`cloud-optimized-geotiffs/cogs-examples.ipnyb` minor edits for clarity

[leothomas]

• Re-order sections from:
  • Download GeoTIFF --> Convert to COG --> Apply COG validation to GeoTIFF -- > Apply COG validation to COG to:
  • Download GeoTIFF --> Apply COG validation to GeoTIFF --> Convert to COG --> Apply COG validation to COG
• Fix typo: create_overvews_from_gtiff to create_overviews_from_gtiff

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PR Preview Action v1.4.4 :---: :rocket: Deployed preview to https://developmentseed.github.io/cloud-optimized-geospatial-formats-guide/pr-preview/pr-35/ on branch gh-pages at 2023-08-22 15:02 UTC

[abarciauskas-bgse]

Thank @leothomas !

[leothomas]

@abarciauskas-bgse Let me know if you'd like me to merge this PR!

[abarciauskas-bgse]

@leothomas yes please merge!