Revised the contents of toString (#192)

Resolves #177

Author: shanshin

core/common/src/RealSink.kt

@@ -148,7 +148,7 @@ internal class RealSink(
         if (thrown != null) throw thrown
     }
 
-    override fun toString() = "buffer($sink)"
+    override fun toString() = "buffered($sink)"
 
     @Suppress("NOTHING_TO_INLINE")
     private inline fun checkNotClosed() {

core/common/src/RealSource.kt

@@ -152,7 +152,7 @@ internal class RealSource(
         bufferField.clear()
     }
 
-    override fun toString(): String = "buffer($source)"
+    override fun toString(): String = "buffered($source)"
 
     @Suppress("NOTHING_TO_INLINE")
     private inline fun checkNotClosed() {

core/jvm/src/SinksJvm.kt

@@ -82,7 +82,7 @@ public fun Sink.asOutputStream(): OutputStream {
 
         override fun close() = this@asOutputStream.close()
 
-        override fun toString() = "${this@asOutputStream}.outputStream()"
+        override fun toString() = "${this@asOutputStream}.asOutputStream()"
     }
 }
 

core/jvm/src/SourcesJvm.kt

@@ -126,7 +126,7 @@ public fun Source.asInputStream(): InputStream {
 
         override fun close() = this@asInputStream.close()
 
-        override fun toString() = "${this@asInputStream}.inputStream()"
+        override fun toString() = "${this@asInputStream}.asInputStream()"
     }
 }