Fix typo in m_model.fpp: odj -> obj

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sbryngelson

src/common/m_model.fpp

@@ -219,7 +219,7 @@ contains
     end subroutine s_read_stl
 
     !> This procedure reads an OBJ file.
-    !! @param filepath Path to the odj file.
+    !! @param filepath Path to the obj file.
     !! @param model The obj file.
     impure subroutine s_read_obj(filepath, model)