Improve sms_to API documentation [ci-skip]
Improve sms_to API documentation [ci-skip]

This tightens the prose a bit.

Vasfed/rails,yawboakye/rails,BlakeWilliams/rails,Vasfed/rails,Erol/rails,bogdanvlviv/rails,Edouard-chin/rails,Edouard-chin/rails,joonyou/rails,Stellenticket/rails,Edouard-chin/rails,betesh/rails,kmcphillips/rails,MSP-Greg/rails,Erol/rails,MSP-Greg/rails,EmmaB/rails-1,Erol/rails,lcreid/rails,rails/rails,Envek/rails,MSP-Greg/rails,georgeclaghorn/rails,kddeisz/rails,yahonda/rails,Envek/rails,yawboakye/rails,lcreid/rails,kddeisz/rails,georgeclaghorn/rails,kddeisz/rails,rails/rails,kmcphillips/rails,joonyou/rails,Stellenticket/rails,Vasfed/rails,betesh/rails,rails/rails,yahonda/rails,georgeclaghorn/rails,yawboakye/rails,Stellenticket/rails,Edouard-chin/rails,Stellenticket/rails,betesh/rails,yawboakye/rails,lcreid/rails,lcreid/rails,BlakeWilliams/rails,esparta/rails,Envek/rails,yahonda/rails,kmcphillips/rails,Vasfed/rails,bogdanvlviv/rails,rails/rails,bogdanvlviv/rails,BlakeWilliams/rails,BlakeWilliams/rails,kddeisz/rails,bogdanvlviv/rails,Erol/rails,EmmaB/rails-1,EmmaB/rails-1,esparta/rails,kmcphillips/rails,esparta/rails,esparta/rails,MSP-Greg/rails,betesh/rails,georgeclaghorn/rails,yahonda/rails,Envek/rails,joonyou/rails,joonyou/rails