[Docs] Fixes for spelling

Running on Ubuntu Xenial results in spelling warnings so update wordlist.

docs/source/contributing/code.md

@@ -61,7 +61,8 @@ which is adhered to with [Black].
         pylint deluge
         pylint deluge/plugins/\*/deluge/
 
-- Using the [pre-commit] app can aid in identifying issues while creating git commits.
+- Using the [pre-commit] application can aid in identifying issues while
+  creating git commits.
 
 #### Strings and bytes
 

docs/source/devguide/packaging/release.md

@@ -28,7 +28,7 @@
   - Sub-directories correspond to _major.minor_ version e.g. all `2.0.x` patch
     releases are stored in `source/2.0`.
   - Change release version in `version` files.
-  - Run `trigger-deluge` to sync OSUOSL ftp site.
+  - Run `trigger-deluge` to sync OSUOSL FTP site.
 - Create packages (Ubuntu, Windows, OSX).
   - Ubuntu: <https://code.launchpad.net/~deluge-team/+recipe/stable-releases>
 

docs/source/devguide/tutorials/01-setup.md

@@ -37,7 +37,7 @@ Download the latest git code to local folder.
 ### Create Python virtual environment
 
 Creation of a [Python virtual environment] keeps the development isolated
-and easier to maintain and tox has an option to make this process easier:
+and easier to maintain and Tox has an option to make this process easier:
 
     tox -e denv3
 
@@ -45,7 +45,7 @@ Activate virtual environment:
 
     source .venv/bin/activate
 
-Deluge will be installed by tox in _develop_ mode which creates links back
+Deluge will be installed by Tox in _develop_ mode which creates links back
 to source code so that changes will be reflected immediately without repeated
 installation. Check it is installed with:
 

docs/spelling_wordlist.txt

@@ -26,3 +26,17 @@ auth
 hostlist
 hostname
 filesystem
+libtorrent
+Multi
+multi
+username
+whitelist
+systemd
+launchd
+plugin
+plugins
+app
+tarball
+tarballs
+Umask
+online