Fix RC2 header in changelog

[pellared]

Fixing the RC2 hyperlink in the header. See: https://github.com/open-telemetry/opentelemetry-go/blob/df15ce086749bb07afdcf3273b382f1e901fbb95/CHANGELOG.md

[codecov]

Codecov Report

Merging #2215 (df15ce0) into main (e209ee7) will decrease coverage by 0.0%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##            main   #2215     +/-   ##
=======================================
- Coverage   72.9%   72.9%   -0.1%     
=======================================
  Files        176     176             
  Lines      12161   12161             
=======================================
- Hits        8870    8867      -3     
- Misses      3053    3055      +2     
- Partials     238     239      +1     

Impacted Files	Coverage Δ
...s/otlp/otlptrace/internal/connection/connection.go	14.8% <0.0%> (-1.6%)	⬇️