Fix acidental unicode character

src/wrf/extension.py

@@ -1569,7 +1569,7 @@ def omp_get_wtime():
     """Return elapsed wall clock time in seconds.
     
     The omp_get_wtime routine returns a value equal to the elapsed wall clock 
-    time in seconds since some “time in the past”. The actual 
+    time in seconds since some "time in the past". The actual 
     “time in the past” is arbitrary, but it is guaranteed not to change during 
     the execution of the application program. The time returned is a 
     “per-thread time”, so it is not required to be globally consistent across