docs(graphql): corrected optional param in Usage section of Readme in opentelemetry-instrumentation-graphql

[saikiran1043]

Which problem is this PR solving?

• Usage section of Readme.md in opentelemetry-instrumentation-graphql has incorrect optional param allowAttributes. It needs to be allowValues.

Short description of the changes

• Corrected Usage section of Readme.md in opentelemetry-instrumentation-graphql to include allowValues instead of allowAttributes.

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ Kiran Kumar Pennujuru (862dfe9)

[codecov]

Codecov Report

Merging #691 (265935f) into main (91a221e) will decrease coverage by 2.53%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #691      +/-   ##
==========================================
- Coverage   97.75%   95.22%   -2.54%     
==========================================
  Files           7       20      +13     
  Lines         357     1591    +1234     
  Branches       56      217     +161     
==========================================
+ Hits          349     1515    +1166     
- Misses          8       76      +68     

Impacted Files	Coverage Δ
...entelemetry-instrumentation-graphql/src/symbols.ts	100.00% <0.00%> (ø)
...metry-instrumentation-graphql/test/graphql.test.ts	100.00% <0.00%> (ø)
...try-instrumentation-graphql/src/instrumentation.ts	92.72% <0.00%> (ø)
.../opentelemetry-instrumentation-graphql/src/enum.ts	100.00% <0.00%> (ø)
...entelemetry-instrumentation-graphql/test/schema.ts	55.84% <0.00%> (ø)
...entelemetry-instrumentation-graphql/test/helper.ts	100.00% <0.00%> (ø)
...umentation-user-interaction/src/instrumentation.ts	95.48% <0.00%> (ø)
...opentelemetry-instrumentation-graphql/src/utils.ts	95.29% <0.00%> (ø)
...opentelemetry-instrumentation-graphql/src/types.ts	100.00% <0.00%> (ø)
...tapackages/auto-instrumentations-node/src/utils.ts	96.77% <0.00%> (ø)
... and 3 more