connect_disconnect: T6261: correction to typo in check_ppp_running function

Connect_disconnect: T6261: correction to typo in check_ppp_running function

Changes include:

1. Replaces "beeing" -> being in print statement for check_ppp_running
2. Replaces "can not" -> cannot in print statement on lines 61 and 93

(cherry picked from commit 19e0d3b74f66e082c3f131b9044e7ca2371b1d85)