Documentation Improvements and Typo Fixes

[Hopium21]

1. In README.md:

• To test as if running on CI, one must limit the number of cores and ram to match github runners (2 core, 7 gig ram)

• To test as if running on CI, one must limit the number of cores and ram to match github runners (2 cores, 7GB RAM)
  Reason: Improves technical accuracy by using proper pluralization and standard units (GB RAM instead of gig ram)

• code coveragte statistics

• code coverage statistics
  Reason: Fixes typo in the word "coverage" to improve documentation readability

2. In crates/examples/push-cdn/README.md:

• The only thing we run it with is with --requirepass to set a password.

• The only thing we run it with --requirepass to set a password.
  Reason: Removes redundant "with" to improve sentence clarity

[CLAassistant]

All committers have signed the CLA.