Fix and improve comments

Shaders/custom_mat_presets/custom_mat_deferred.vert.glsl

@@ -5,7 +5,7 @@ uniform mat4 WVP;
 // Matrix to transform normals from local into world space
 uniform mat3 N;
 
-// Position and normal vector in local space for the current vertex
+// Position and normal vectors of the current vertex in local space
 // Armory packs the vertex data to preserve memory, so nor.z values are
 // saved in pos.w
 in vec4 pos; // pos.xyz, nor.w

Shaders/custom_mat_presets/custom_mat_forward.vert.glsl

@@ -3,7 +3,7 @@
 // World to view projection matrix to correctly position the vertex on screen
 uniform mat4 WVP;
 
-// Position and normal vector in local space for the current vertex
+// Position vector of the current vertex in local space
 in vec3 pos;
 
 void main() {