fix some typos

CONTRIBUTING.md

@@ -190,7 +190,7 @@ If you're a good designer, whether it's _2D graphics, 3D graphics, interfaces, w
 
 ### <a name="patreon"> Patreon </a>
 
-Our **BDFL**, [jackpot51](https://github.com/jackpot51), has a [Patreon campaign](https://www.patreon.com/redox_os)! **All money recieved will go towards Redox OS development**. If you donate, you will be listed in the **Redox credits** as one of the people that made Redox OS possible. You'll also get other rewards the more you donate. However, please don't donate if you can't afford it.
+Our **BDFL**, [jackpot51](https://github.com/jackpot51), has a [Patreon campaign](https://www.patreon.com/redox_os)! **All money received will go towards Redox OS development**. If you donate, you will be listed in the **Redox credits** as one of the people that made Redox OS possible. You'll also get other rewards the more you donate. However, please don't donate if you can't afford it.
 
 <!--
 

bootstrap.sh

@@ -266,7 +266,7 @@ suse()
 }
 
 ##############################################################################
-# This function takes care of installing all dependencies for builing redox on
+# This function takes care of installing all dependencies for building redox on
 # gentoo linux
 # @params:	$1 the emulator to install, virtualbox or qemu
 ##############################################################################
@@ -297,7 +297,7 @@ gentoo()
 }
 
 ##############################################################################
-# This function takes care of installing all dependencies for builing redox on
+# This function takes care of installing all dependencies for building redox on
 # SolusOS
 # @params:	$1 the emulator to install, virtualbox or qemu
 ##############################################################################

docker/README.md

@@ -18,7 +18,7 @@ toolchain versions, you don't need to update the container.
 git clone https://github.com/redox-os/redox.git ; cd redox
 ```
 
-### Upate the source tree
+### Update the source tree
 Note: if you use the container on a different host or
 with a different user, [get the sources first](#get_the_sources).
 ```shell