docs(auto-instrumentations-node): improved readme

[CptSchnitz]

Which problem is this PR solving?

• auto-instrumentations-node docs #497

Short description of the changes

• Added a summary of what the package does to the readme.
• Added a list of instrumentations the package loads to the readme.
• Fixed the example so it uses resource instead of serviceName.

[codecov]

Codecov Report

Merging #563 (ee32d5d) into main (52b46aa) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #563      +/-   ##
==========================================
+ Coverage   94.74%   94.77%   +0.02%     
==========================================
  Files         176      179       +3     
  Lines       10647    10921     +274     
  Branches     1018     1086      +68     
==========================================
+ Hits        10088    10350     +262     
- Misses        559      571      +12     

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

[obecny]

lgtm, just please replace double quotes with single quotes

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ CptSchnitz (449d5cc, ee32d5d)

[CptSchnitz]

@obecny looks like the unit test failed because of a timeout.