spelling error fixed for AvailbleBSPositions#6556

pritam-chowdhury wants to merge 2 commits intovalor-software:developmentvalor-software/ngx-bootstrap:developmentfrom

pritam-chowdhury:fix-spelling-mistake-availbleBSPositionspritam-chowdhury/ngx-bootstrap:fix-spelling-mistake-availbleBSPositionsCopy head branch name to clipboard