fix(docs): fix scope name on association scope

[JuarezLustosa]

Description of change

Simple documentation fix, wrong scope name.

Closes #12198

[codecov]

Codecov Report

Merging #12204 into master will increase coverage by 2.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #12204      +/-   ##
==========================================
+ Coverage   94.28%   96.34%   +2.05%     
==========================================
  Files          95       95              
  Lines        9181     9181              
==========================================
+ Hits         8656     8845     +189     
+ Misses        525      336     -189     

Impacted Files	Coverage Δ
lib/dialects/abstract/query-generator.js	97.13% <0.00%> (+0.16%)	⬆️
lib/dialects/abstract/query.js	91.98% <0.00%> (+0.32%)	⬆️
lib/sequelize.js	95.87% <0.00%> (+3.17%)	⬆️
lib/dialects/mysql/query-generator.js	97.61% <0.00%> (+3.33%)	⬆️
lib/dialects/mysql/data-types.js	98.43% <0.00%> (+54.68%)	⬆️
lib/dialects/mysql/connection-manager.js	96.29% <0.00%> (+66.66%)	⬆️
lib/dialects/mysql/query.js	98.29% <0.00%> (+83.76%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a5a60f9...e153652. Read the comment docs.