doc: add warning about relative paths on linux, missing space (#125)

docs/advanced-usage/installation.md

@@ -54,7 +54,7 @@ curl -fsSL https://raw.githubusercontent.com/spicetify/spicetify-cli/master/inst
 brew install spicetify-cli
 ```
 
-On macOS, you will need to set`spotify_path` to `/Applications/Spotify.app/Contents/Resources` in the `~/.config/spicetify/config-xpui.ini` config file.
+On macOS, you will need to set `spotify_path` to `/Applications/Spotify.app/Contents/Resources` in the `~/.config/spicetify/config-xpui.ini` config file.
 
 ### AUR
 
@@ -77,10 +77,12 @@ sudo chmod a+wr /opt/spotify/Apps -R
 
 #### Spotify installed via `spotify-launcher` package (Arch Linux)
 
-If Spotify is installed through the `spotify-launcher` package, then Spotify won't install to `/opt/spotify` and is instead in this folder: `~/.local/share/spotify-launcher/install/usr/share/spotify/`
+If Spotify is installed through the `spotify-launcher` package, then Spotify won't install to `/opt/spotify` and is instead in this folder: `$HOME/.local/share/spotify-launcher/install/usr/share/spotify/`
 
 This directory will need to be added to the `spotify-path` section of the config (and you won't need to change any permissions like the AUR method). 
 
+**Note:** `spotify-path` must be an abslolute path. Do not use `~` to reference the home folder.
+
 #### Spotify installed from Snap
 
 Apps installed from Snap **cannot be modified** so you need to follow these steps to get Spicetify working: