docs: cleanup header levels in backend docs (#5698)

docs/content/box.md

@@ -13,6 +13,8 @@ The initial setup for Box involves getting a token from Box which you
 can do either in your browser, or with a config.json downloaded from Box
 to use JWT authentication.  `rclone config` walks you through it.
 
+## Configuration
+
 Here is an example of how to make a remote called `remote`.  First run:
 
      rclone config
@@ -99,7 +101,7 @@ To copy a local directory to an Box directory called backup
 
     rclone copy /home/source remote:backup
 
-### Using rclone with an Enterprise account with SSO ###
+### Using rclone with an Enterprise account with SSO
 
 If you have an "Enterprise" account type with Box with single sign on
 (SSO), you need to create a password to use Box with rclone. This can
@@ -110,7 +112,7 @@ Once you have done this, you can setup your Enterprise Box account
 using the same procedure detailed above in the, using the password you
 have just set.
 
-### Invalid refresh token ###
+### Invalid refresh token
 
 According to the [box docs](https://developer.box.com/v2.0/docs/oauth-20#section-6-using-the-access-and-refresh-tokens):
 
@@ -194,7 +196,7 @@ d) Delete this remote
 y/e/d> y
 ```
 
-### Modified time and hashes ###
+### Modified time and hashes
 
 Box allows modification times to be set on objects accurate to 1
 second.  These will be used to detect whether objects need syncing or
@@ -203,7 +205,7 @@ not.
 Box supports SHA1 type hashes, so you can use the `--checksum`
 flag.
 
-#### Restricted filename characters
+### Restricted filename characters
 
 In addition to the [default restricted characters set](/overview/#restricted-characters)
 the following characters are also replaced:
@@ -222,14 +224,14 @@ These only get replaced if they are the last character in the name:
 Invalid UTF-8 bytes will also be [replaced](/overview/#invalid-utf8),
 as they can't be used in JSON strings.
 
-### Transfers ###
+### Transfers
 
 For files above 50 MiB rclone will use a chunked transfer.  Rclone will
 upload up to `--transfers` chunks at the same time (shared among all
 the multipart uploads).  Chunks are buffered in memory and are
 normally 8 MiB so increasing `--transfers` will increase memory use.
 
-### Deleting files ###
+### Deleting files
 
 Depending on the enterprise settings for your user, the item will
 either be actually deleted from Box or moved to the trash.
@@ -240,7 +242,7 @@ may take a very long time.
 Emptying the trash via the  WebUI does not have this limitation 
 so it is advised to empty the trash via the WebUI.
 
-### Root folder ID ###
+### Root folder ID
 
 You can set the `root_folder_id` for rclone.  This is the directory
 (identified by its `Folder ID`) that rclone considers to be the root
@@ -397,7 +399,7 @@ See: the [encoding section in the overview](/overview/#encoding) for more info.
 
 {{< rem autogenerated options stop >}}
 
-### Limitations ###
+## Limitations
 
 Note that Box is case insensitive so you can't have a file called
 "Hello.doc" and one called "hello.doc".