fix grammatical mistakes in carousel docs
fix grammatical mistakes in carousel docs

BS3 commit d344ca4

2947721120/todc-bootstrap,todc/todc-bootstrap,up2vs/todc-bootstrap,2947721120/googlebt4,todc/todc-bootstrap,todc/todc-bootstrap,ztx1491/todc-bootstrap,mozillo/todc-bootstrap,aaroncnhk/todc-bootstrap