Adjust content to use released v0.50 and other tags.

[xavierlepretre]

Instructions: (For B9lab use only!) Please fill out the following items in brackets [ ], following the b9lab-processes guideline.

Documentation content update for hands-on-exercise's "native checkers" chapter.

This PR adjusts content to use the newly released Cosmos SDK v0.50 Git tags and those of the minimal app and example module.

R1: Internal review (B9lab)

• Technical review
  • [ ] requested
  • [ ] completed
• Language review
  • [ ] requested
  • [ ] completed

R2: External review

• Technical review
  • [ ] requested
  • [ ] completed
• Language review
  • [ ] requested
  • [ ] completed

R3: Internal QA review (B9lab)

• Technical review
  • [ ] requested
  • [ ] completed
• Language review
  • [ ] requested
  • [ ] completed

R4: Final external QA review

• Technical review
  • [ ] requested
  • [ ] completed
• Language review
  • [ ] requested
  • [ ] completed

RC: Release Candidate

• [ ] Ready to be merged

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[coldice]

LGTM, @xavierlepretre bypass external review?

[xavierlepretre]

LGTM, @xavierlepretre bypass external review?

Yep