docs: Fix baggage span processor NPM links

[MikeGoldsmith]

Which problem is this PR solving?

Fixes the NPM links in the Baggage Span Processor README.

Short description of the changes

• Update the img and url links in README

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.47%. Comparing base (dfb2dff) to head (9d11b90).
Report is 108 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2185      +/-   ##
==========================================
- Coverage   90.97%   90.47%   -0.51%     
==========================================
  Files         146      149       +3     
  Lines        7492     7592     +100     
  Branches     1502     1591      +89     
==========================================
+ Hits         6816     6869      +53     
- Misses        676      723      +47     

see 35 files with indirect coverage changes

[hectorhdzg]

LGTM

[JamieDanielson]

Oops, thanks Mike!