Renamed the headers to make them unique

Author: ImadSaddik

docs/install/build.mdx

@@ -140,7 +140,7 @@ use them for development.
 
 ## Linux
 
-### Dependencies
+### Linux Dependencies
 
 On Linux, you'll need to install header packages for Ghostty's dependencies
 before building it. Only a few dependencies are needed for source builds
@@ -344,7 +344,7 @@ Ghostty can be built reliably.
 
 ## macOS
 
-### Dependencies
+### macOS Dependencies
 
 #### Xcode
 
@@ -368,7 +368,7 @@ is installed.
 Next, make sure you have both the macOS and iOS SDKs installed (from
 inside Xcode → Settings → Components).
 
-#### Other Dependencies
+#### Other macOS Dependencies
 
 Ghostty also requires some additional library dependencies to be
 installed. You can choose to install them however you'd like, but