Add some details for non visible scrollspy elements (#36625)
Add some details for non visible scrollspy elements (#36625)

* docs: add some details for non visible scrollspy elements

* Apply suggestions from code review

Co-authored-by: Julien Déramond <85f14dde02ac1aa73d4e2d3b06d86d1794b6488c@orange.com>

* fix selectors on snippet

* Fix paragraph by a native speaker

Co-authored-by: Mark Otto <12d1534cbab533fa770a644b94441a210fc71171@gmail.com>

* Update scrollspy.md

* Move from warning to own section

* Update scrollspy.md

Co-authored-by: Julien Déramond <85f14dde02ac1aa73d4e2d3b06d86d1794b6488c@orange.com>
Co-authored-by: Julien Déramond <3c3af417ccee945017345d61641447cf3d6817fd@gmail.com>
Co-authored-by: Mark Otto <12d1534cbab533fa770a644b94441a210fc71171@gmail.com>
Co-authored-by: Mark Otto <8e98a0168d63b85b649084b850812c39fe15cb78@gmail.com>
coliff/bootstrap,coliff/bootstrap,tjkohli/bootstrap,inway/bootstrap,inway/bootstrap,tjkohli/bootstrap,m5o/bootstrap,twbs/bootstrap,m5o/bootstrap,inway/bootstrap,twbs/bootstrap