docs: add missing fetch instrumentation

[meteorlxy]

Which problem is this PR solving?

• add missing link to @opentelemetry/instrumentation-fetch package

Short description of the changes

• add missing link to @opentelemetry/instrumentation-fetch package

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ meteorlxy (5aeed03)

[obecny]

lgtm

[codecov]

Codecov Report

Merging #622 (1bac840) into main (979d69b) will decrease coverage by 0.81%.
The diff coverage is n/a.

❗ Current head 1bac840 differs from pull request most recent head 5eb640f. Consider uploading reports for the commit 5eb640f to get more accurate results

@@            Coverage Diff             @@
##             main     #622      +/-   ##
==========================================
- Coverage   97.50%   96.68%   -0.82%     
==========================================
  Files          10       13       +3     
  Lines         360      634     +274     
  Branches       56      124      +68     
==========================================
+ Hits          351      613     +262     
- Misses          9       21      +12     

Impacted Files	Coverage Δ
...ation-user-interaction/src/enums/AttributeNames.ts	100.00% <0.00%> (ø)
...umentation-user-interaction/src/instrumentation.ts	95.48% <0.00%> (ø)
...ry-instrumentation-user-interaction/src/version.ts	100.00% <0.00%> (ø)

[blumamir]

BTW, node list also has many missing instrumentations if you're up to it. Can also be added in a different PR

[johnbley]

Thanks!