Fixes small error in ActiveRecord::Reflection docs

[ci skip]
[ci skip] fix markdown
Merge pull request #16377 from JackDanger/doc-fix-in-association-reflection

Fixes small error in ActiveRecord::Reflection docs
updating documented parameter for build_constraint

Updates documentation in line with changes made in
743b67508e2027e1d086142ccbec47a19fc943f6
Merge pull request #16378 from JackDanger/doc-fix-in-join-association-build_constraint

[doc] updating documented parameter for build_constraint
[ci skip] Remove "Machinist" from testing guide
Merge pull request #16380 from y-yagi/patch-1

[ci skip] Remove "Machinist" from testing guide
[ci skip] add tip for uglifier in execjs error
Merge pull request #16306 from aditya-kapoor/add-docs-for-uglifier

[ci skip] add tip for uglifier in execjs error