some texts fixed

docs/bipack.md

@@ -5,7 +5,7 @@ This library contains a `Bipack` binary format serializer, see [net.sergeych.bip
 
 # Package net.sergeych.bipack
 
-Bipack ais a common kotlinx serializer that works pretty much like any other `kotlinx.serialization` format. You just mark your class as `@Serializable` and it does the rest.
+Bipack is a common kotlinx serializer that works pretty much like any other `kotlinx.serialization` format. You just mark your class as `@Serializable` and it does the rest.
 
 - [BipackEncoder] to serializes anything to bipack format.
 - [BipackDecoder] deserializes from bipack back.