Fix some small typos in the Text docs.
Fix some small typos in the Text docs.

simonh1000/core,Pisys/core,colinmccabe/core,isaacsanders/core,colinmccabe/core,rick68/core,isaacsanders/core,bradurani/core,rgrempel/core,laszlopandy/core,alexiamcdonald/elm-core,eeue56/core,suryagaddipati/core,ThomasWeiser/core,eeue56/core,manleyjster/core,bradurani/core,krisajenkins/core,martinos/core,Pisys/core,alexiamcdonald/elm-core,manleyjster/core,rgrempel/core,suryagaddipati/core,vilterp/core,vilterp/core,simonh1000/core,martinos/core,Dandandan/core,rick68/core,Dandandan/core,ThomasWeiser/core,krisajenkins/core,laszlopandy/core