doc: fix grammar: "your" -> "you're"

where it's meant to be a contraction of
"you are" rather than a possessive pronoun

doc/CONTRIBUTING.md

@@ -21,7 +21,7 @@ If you wish to contribute please follow these guidelines:
 
 * The commit message follows the same semantics as [nixpkgs][nixpkgs].
   * You can use a `#` symbol to specify ambiguities. For example,
-  `develop#zsh: <rest of commit message>` would tell me that your updating the
+  `develop#zsh: <rest of commit message>` would tell me that you're updating the
   `zsh` subprofile living under the `develop` profile.
 
 [nixpkgs-fmt]: https://github.com/nix-community/nixpkgs-fmt

doc/integrations/cachix.md

@@ -1,6 +1,6 @@
 # Cachix
 The system will automatically pull a cachix.nix at the root if one exists.
-This is usually created automatically by a `sudo cachix use`. If your more
+This is usually created automatically by a `sudo cachix use`. If you're more
 inclined to keep the root clean, you can drop any generated files in the
 `cachix` directory into the `profiles/cachix` directory without further
 modification.

doc/start/from-nixos.md

@@ -1,7 +1,7 @@
 # From NixOS
 
 ## Generate Configuration
-Assuming your happy with your existing partition layout, you can generate a
+Assuming you're happy with your existing partition layout, you can generate a
 basic NixOS configuration for your system using:
 ```sh
 flk up
@@ -28,7 +28,7 @@ Now might be a good time to read the docs on [suites](../concepts/suites.md) and
 > them directly into a host module of your own making, and commit that instead.
 # Installation
 
-Once your ready to deploy `hosts/my-host.nix`:
+Once you're ready to deploy `hosts/my-host.nix`:
 ```sh
 flk my-host switch
 ```