Update examples/projections/cyl/cyl_universal_transverse_mercator.py

Author: seisman

examples/projections/cyl/cyl_universal_transverse_mercator.py

@@ -16,7 +16,7 @@
 
 **u**\ *zone/scale* or **U**\ *zone/width*
 
-the projection is set with *u* or *U*. *zone* sets the zone for the figure, and
+the projection is set with **u** or **U**. *zone* sets the zone for the figure, and
 the figure size is set wtih *scale* or *width*.
 """
 import pygmt