Documentation: Fix typos and standardize terminology in markdown files

[kube-gopher]

Description:

Several typographical errors and inconsistent terminology have been identified in the project documentation files. These minor errors affect the professionalism and clarity of the documentation.

Files and errors identified:

1. Downloads.md

• Incorrect: where as

• Correct: whereas (conjunction expressing contrast)

2. RELEASE.md

• Incorrect: abbrieviated

• Correct: abbreviated

3. ISSUE.md

• Incorrect: repoducer (2 instances)

• Correct: reproducer

• Inconsistent: UT

• Standard: UTC (Coordinated Universal Time)