added MAL2Go/user/manga docs

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+---
+title: "Update Manga"
+description: "Update every field of an manga"
+weight: 14
+---
+
+The `UpdateManga` method combines all the other methods used to update any of the fields of an entry in the mangalist.
+
+**Warning: This method will overwrite every field of the specified manga.  
+If you don't specify a field it'd be set back to the default option. 
+Use it with caution at your own risk.**
+
+- `id int` ID of the manga
+- `updateData `[`UpdateMangaData`](/docs/mal2go/v4/user/manga/types/#mal2gousermangaupdatemangadata) 
+A struct containing all the fields that need to be updated. **If a field is missing it will be set to the default option.**
+
+Example:
+
+``` go
+package main
+
+import (
+  "github.com/MikunoNaka/MAL2Go/v4/user/manga"
+  "log"
+  "fmt"
+)
+
+func main() {
+  authToken := "YOUR_TOKEN_HERE"
+  myClient := manga.Client {
+    AuthToken: "Bearer " + authToken,
+  }
+  
+  updateData := manga.UpdateMangaData {
+    Status:         "reading",
+    IsRereading:    false, 
+    Score:          10, 
+    ChaptersRead:   20,
+    Priority:       2,
+    TimesReread:    0, 
+    RereadValue:    0,
+    Tags:           "",
+    Comments:       "",
+  }
+
+  res, err := myClient.UpdateManga(82745, updateData)
+  if err != nil {
+    log.Fatal(err)
+  }
+  
+  fmt.Println(res)
+}
+```
+
+This is useful if you want to update many things without making too many API calls.
+You can get the previously set data with the `GetMangaById` method, if a value needs to be
+unchanged, just use the previously set value returned by GetMangaById. This way, 
+you can update multiple fields with only two API calls.
+
+The [response](/docs/mal2go/v4/user/manga/types/#mal2gousermangaupdateresponse) from the API can be used to show the information of the manga after being updated.