[FIX] Docs: Backup&Restore: fixed rendering + minor fixes (#6569)

- Fixed a code block inverting the code blocks of the rest of the page
- Fixed various markdown syntax errors
- Fixed some spelling I could notice

Signed-off-by: 0x5c <0x5c.dev@gmail.com>

docs/content/doc/usage/backup-and-restore.en-us.md

@@ -20,10 +20,10 @@ file can be unpacked and used to restore an instance.
 
 ## Backup Command (`dump`)
 
-Switch to the user running gitea: `su git`. Run `./gitea dump -c /path/to/app.ini` in the gitea installation
+Switch to the user running Gitea: `su git`. Run `./gitea dump -c /path/to/app.ini` in the Gitea installation
 directory. There should be some output similar to the following:
 
-```
+```none
 2016/12/27 22:32:09 Creating tmp work dir: /tmp/gitea-dump-417443001
 2016/12/27 22:32:09 Dumping local repositories.../home/git/gitea-repositories
 2016/12/27 22:32:22 Dumping database...
@@ -35,7 +35,7 @@ directory. There should be some output similar to the following:
 Inside the `gitea-dump-1482906742.zip` file, will be the following:
 
 * `app.ini` - Optional copy of configuration file if originally stored outside of the default `custom/` directory
-* `custom` - All config or customerize files in `custom/`.
+* `custom` - All config or customization files in `custom/`.
 * `data` - Data directory in <GITEA_WORK_DIR>, except sessions if you are using file session. This directory includes `attachments`, `avatars`, `lfs`, `indexers`, sqlite file if you are using sqlite.
 * `gitea-db.sql` - SQL dump of database
 * `gitea-repo.zip` - Complete copy of the repository directory.
@@ -45,15 +45,18 @@ Intermediate backup files are created in a temporary directory specified either
 `--tempdir` command-line parameter or the `TMPDIR` environment variable.
 
 ### Using Docker (`dump`)
+
 There are a few caveats for using the `dump` command with Docker.
 
 The command has to be executed with the `RUN_USER = <OS_USERNAME>` specified in `gitea/conf/app.ini`; and, for the zipping of the backup folder to occur without permission error the command `docker exec` must be executed inside of the `--tempdir`.
 
 Example:
 
-```docker exec -u <OS_USERNAME> -it -w <--tempdir> $(docker ps -qf "name=<NAME_OF_DOCKER_CONTAINER>") bash -c '/app/gitea/gitea dump -c </path/to/app.ini>'```
+```none
+docker exec -u <OS_USERNAME> -it -w <--tempdir> $(docker ps -qf "name=<NAME_OF_DOCKER_CONTAINER>") bash -c '/app/gitea/gitea dump -c </path/to/app.ini>'
+```
 
-*Note: `--tempdir` refers to the temporary directory of the docker enviroment used by gitea; if you have not specified a custom `--tempdir`, then gitea uses `/tmp` or the `TMPDIR` enviromental variable of the docker container. For `--tempdir` adjust your `docker exec` command options accordingly.
+*Note: `--tempdir` refers to the temporary directory of the docker environment used by Gitea; if you have not specified a custom `--tempdir`, then Gitea uses `/tmp` or the `TMPDIR` environment variable of the docker container. For `--tempdir` adjust your `docker exec` command options accordingly.
 
 The result should be a file, stored in the `--tempdir` specified, along the lines of: `gitea-dump-1482906742.zip`
 
@@ -63,7 +66,8 @@ There is currently no support for a recovery command. It is a manual process tha
 involves moving files to their correct locations and restoring a database dump.
 
 Example:
-```
+
+```none
 apt-get install gitea
 unzip gitea-dump-1482906742.zip
 cd gitea-dump-1482906742