MINOR: (docs) in section, not at section
MINOR: (docs) in section, not at section

See https://english.stackexchange.com/questions/158981/at-this-section-vs-in-this-section and https://forum.wordreference.com/threads/at-in-within-the-section-we-can-find.374188/

Author: mihbor <mbor81@gmail.com>

Reviewers: Guozhang Wang <wangguoz@gmail.com>

Closes #3228 from mihbor/patch-8

MyPureCloud/kafka,ErikKringen/kafka,sebadiaz/kafka,sebadiaz/kafka,ollie314/kafka,airbnb/kafka,Ishiihara/kafka,Ishiihara/kafka,mihbor/kafka,sslavic/kafka,lindong28/kafka,guozhangwang/kafka,MyPureCloud/kafka,ollie314/kafka,apache/kafka,Chasego/kafka,lindong28/kafka,Chasego/kafka,sslavic/kafka,MyPureCloud/kafka,Ishiihara/kafka,noslowerdna/kafka,Esquive/kafka,sslavic/kafka,KevinLiLu/kafka,ollie314/kafka,richhaase/kafka,TiVo/kafka,guozhangwang/kafka,apache/kafka,ErikKringen/kafka,themarkypantz/kafka,sslavic/kafka,mihbor/kafka,guozhangwang/kafka,Esquive/kafka,gf53520/kafka,TiVo/kafka,Chasego/kafka,Ishiihara/kafka,lindong28/kafka,lindong28/kafka,sebadiaz/kafka,Chasego/kafka,noslowerdna/kafka,ErikKringen/kafka,KevinLiLu/kafka,richhaase/kafka,mihbor/kafka,apache/kafka,KevinLiLu/kafka,ollie314/kafka,Esquive/kafka,MyPureCloud/kafka,richhaase/kafka,themarkypantz/kafka,noslowerdna/kafka,sebadiaz/kafka,airbnb/kafka,Esquive/kafka,richhaase/kafka,ErikKringen/kafka,guozhangwang/kafka,airbnb/kafka,mihbor/kafka,gf53520/kafka,noslowerdna/kafka,gf53520/kafka,airbnb/kafka,themarkypantz/kafka,KevinLiLu/kafka,themarkypantz/kafka,apache/kafka,TiVo/kafka,TiVo/kafka,gf53520/kafka