Fix wrong docs about default image upload location

We wrongly state that the default image upload location is imgur. This
is no longer true, but got lost when updating docs. This commit should
fix it.

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

Author: SISheogorath

README.md

@@ -202,7 +202,7 @@ There are some config settings you need to change in the files below.
 | `HMD_EMAIL` | `true` or `false` | set to allow email signin |
 | `HMD_ALLOW_PDF_EXPORT` | `true` or `false` | Enable or disable PDF exports |
 | `HMD_ALLOW_EMAIL_REGISTER` | `true` or `false` | set to allow email register (only applied when email is set, default is `true`. Note `bin/manage_users` might help you if registration is `false`.) |
-| `HMD_IMAGE_UPLOAD_TYPE` | `imgur`, `s3`, `minio` or `filesystem` | Where to upload image. For S3, see our Image Upload Guides for [S3](docs/guides/s3-image-upload.md) or [Minio](docs/guides/minio-image-upload.md) |
+| `HMD_IMAGE_UPLOAD_TYPE` | `imgur`, `s3`, `minio` or `filesystem` | Where to upload images. For S3, see our Image Upload Guides for [S3](docs/guides/s3-image-upload.md) or [Minio](docs/guides/minio-image-upload.md) |
 | `HMD_S3_ACCESS_KEY_ID` | no example | AWS access key id |
 | `HMD_S3_SECRET_ACCESS_KEY` | no example | AWS secret key |
 | `HMD_S3_REGION` | `ap-northeast-1` | AWS S3 region |
@@ -263,7 +263,7 @@ There are some config settings you need to change in the files below.
 | `documentMaxLength` | `100000` | note max length |
 | `email` | `true` or `false` | set to allow email signin |
 | `allowEmailRegister`  | `true` or `false` | set to allow email register (only applied when email is set, default is `true`. Note `bin/manage_users` might help you if registration is `false`.) |
-| `imageUploadType` | `imgur`(default), `s3`, `minio`, `azure` or `filesystem` | Where to upload image
+| `imageUploadType` | `imgur`, `s3`, `minio`, `azure` or `filesystem`(default) | Where to upload images. For S3, see our Image Upload Guides for [S3](docs/guides/s3-image-upload.md) or [Minio](docs/guides/minio-image-upload.md)|
 | `minio` | `{ "accessKey": "YOUR_MINIO_ACCESS_KEY", "secretKey": "YOUR_MINIO_SECRET_KEY", "endpoint": "YOUR_MINIO_HOST", port: 9000, secure: true }` | When `imageUploadType` is set to `minio`, you need to set this key. Also checkout our [Minio Image Upload Guide](docs/guides/minio-image-upload.md) |
 | `s3` | `{ "accessKeyId": "YOUR_S3_ACCESS_KEY_ID", "secretAccessKey": "YOUR_S3_ACCESS_KEY", "region": "YOUR_S3_REGION" }` | When `imageuploadtype` be set to `s3`, you would also need to setup this key, check our [S3 Image Upload Guide](docs/guides/s3-image-upload.md) |
 | `s3bucket` | `YOUR_S3_BUCKET_NAME` | bucket name when `imageUploadType` is set to `s3` or `minio` |