several refactoring things and docs appending

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/bot/Ktor/base/MultipartRequestCallFactory.kt

@@ -25,10 +25,9 @@ object MultipartRequestCallFactory : AbstractRequestCallFactory() {
                             Headers.build {
                                 append(HttpHeaders.ContentType, value.mimeType)
                                 append(HttpHeaders.ContentDisposition, "filename=${value.fileId}")
-                            }
-                        ) {
-                            value.file.asInput()
-                        }
+                            },
+                            block = value.file::input
+                        )
                         is FileId -> append(key, value.fileId)
                         else -> append(key, value.toString())
                     }

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/utils/StorageFile.kt

@@ -5,19 +5,40 @@ import io.ktor.utils.io.core.ByteReadPacket
 import io.ktor.utils.io.core.Input
 import kotlinx.serialization.Serializable
 
+/**
+ * Information about file for [StorageFile]
+ *
+ * @param contentType Raw type like "application/json"
+ * @param fileName This filename will be used in telegram system as name of file
+ */
 @Serializable
 data class StorageFileInfo(
     val contentType: String,
     val fileName: String
 ) {
+    /**
+     * This methods is required for random generation of name for keeping warranties about unique file name
+     */
     fun generateCustomName() = "${uuid4()}.${fileName.fileExtension}"
 }
 
+/**
+ * Contains info about file, which potentially can be sent to telegram system.
+ *
+ * @param storageFileInfo Information about this file
+ * @param inputSource Lambda which able to allocate [Input] for uploading/manipulating data
+ *
+ * @see StorageFileInfo
+ * @see asStorageFile
+ */
 data class StorageFile(
     val storageFileInfo: StorageFileInfo,
     private val inputSource: () -> Input
 ) {
-    fun asInput() = inputSource()
+    val input: Input
+        get() = inputSource()
+    @Deprecated("This method will be fully replaced with input property", ReplaceWith("input"))
+    fun asInput() = input
 }
 
 @Suppress("NOTHING_TO_INLINE")
@@ -31,5 +52,8 @@ inline fun StorageFile(
     ByteReadPacket(bytes)
 }
 
-@Suppress("NOTHING_TO_INLINE")
+/**
+ *
+ */
+@Suppress("NOTHING_TO_INLINE", "unused")
 inline fun ByteArray.asStorageFile(fileName: String, mimeType: MimeType) = StorageFile(fileName, this, mimeType)