fix: typos (#4202)

Co-authored-by: Bart Louwers <bart@emeel.net>

src/mbgl/gl/renderer_backend.cpp

@@ -103,7 +103,7 @@ void registerTypes(gfx::ShaderRegistry& registry, const ProgramParameters& progr
     /// in the parameter pack and register it with the shader registry.
 
     /// Registration calls are wrapped in a lambda that throws on registration
-    /// failure, we shouldn't expect registration to faill unless the shader
+    /// failure, we shouldn't expect registration to fail unless the shader
     /// registry instance provided already has conflicting programs present.
     (
         [&]() {