Fix some typos in `no-floating-promises` rule docs. (#3886)
Fix some typos in `no-floating-promises` rule docs. (#3886)


andy-hanson/tslint,andy-hanson/tslint,palantir/tslint,mprobst/tslint,JoshuaKGoldberg/tslint,palantir/tslint,palantir/tslint,mprobst/tslint,andy-ms/tslint,andy-ms/tslint,andy-hanson/tslint,JoshuaKGoldberg/tslint,mprobst/tslint,andy-ms/tslint,JoshuaKGoldberg/tslint