Update input-group.md with form text example (#37406)
Update input-group.md with form text example (#37406)

* Update input-group.md with form text example

This updated example shows where to correctly put form text (i.e. not inside the input group).

* Fix markup

* Update input-group.md

Co-authored-by: Mark Otto <12d1534cbab533fa770a644b94441a210fc71171@gmail.com>
coliff/bootstrap,twbs/bootstrap,coliff/bootstrap,twbs/bootstrap