added hunspell for building deps (#6705)

Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

BUILDING_ON_LINUX.md

@@ -17,13 +17,13 @@ The built binary should be exportable from the final image & able to run on your
 ### Debian 13 (trixie) or later
 
 ```sh
-sudo apt install qt6-base-dev qt6-svg-dev qt6-image-formats-plugins libboost-dev libnotify-dev libssl-dev libsecret-1-dev pkg-config cmake g++ git
+sudo apt install qt6-base-dev qt6-svg-dev qt6-image-formats-plugins libboost-dev libnotify-dev libssl-dev libsecret-1-dev pkg-config cmake g++ git hunspell
 ```
 
 ### Arch Linux
 
 ```sh
-sudo pacman -S --needed qt6-base qt6-tools boost-libs openssl qt6-imageformats qt6-svg boost libnotify rapidjson pkgconf cmake
+sudo pacman -S --needed qt6-base qt6-tools boost-libs openssl qt6-imageformats qt6-svg boost libnotify rapidjson pkgconf cmake hunspell
 ```
 
 If you use Wayland, you will also need to ensure `qt6-wayland` is installed.
@@ -35,13 +35,13 @@ Alternatively you can use the [chatterino2-git](https://aur.archlinux.org/packag
 _Most likely works the same for other Red Hat-like distros. Substitute `dnf` with `yum`._
 
 ```sh
-sudo dnf install qt6-qtbase-devel qt6-qtimageformats qt6-qtsvg-devel g++ git openssl-devel boost-devel libnotify-devel cmake
+sudo dnf install qt6-qtbase-devel qt6-qtimageformats qt6-qtsvg-devel g++ git openssl-devel boost-devel libnotify-devel cmake hunspell
 ```
 
 ### NixOS 18.09+
 
 ```sh
-nix-shell -p openssl boost qt6.full pkg-config cmake libnotify
+nix-shell -p openssl boost qt6.full pkg-config cmake libnotify hunspell
 ```
 
 ## Compile
@@ -55,7 +55,7 @@ nix-shell -p openssl boost qt6.full pkg-config cmake libnotify
    ```
 1. Generate build files. To enable Lua plugins in your build add `-DCHATTERINO_PLUGINS=ON` to this command.
    ```sh
-   cmake -DBUILD_WITH_QTKEYCHAIN=OFF ..
+   cmake -DBUILD_WITH_QTKEYCHAIN=OFF -DCHATTERINO_SPELLCHECK=On ..
    ```
 1. Build the project
    ```sh