Fix typos in cylindrical projection examples (#2035)

Author: yvonnefroehlich

examples/projections/cyl/cyl_oblique_mercator_3.py

@@ -18,7 +18,7 @@
 import pygmt
 
 fig = pygmt.Figure()
-# Using the origin projection pole
+# Using the origin and projection pole
 fig.coast(
     projection="Oc280/25.5/22/69/12c",
     # Set bottom left and top right coordinates of the figure with "+r"

examples/projections/cyl/cyl_universal_transverse_mercator.py

@@ -5,20 +5,20 @@
 A particular subset of the transverse Mercator is the Universal Transverse
 Mercator (UTM) which was adopted by the US Army for large-scale military maps.
 Here, the globe is divided into 60 zones between 84°S and 84°N, most of which
-are 6 wide. Each of these UTM zones have their unique central meridian.
-Furthermore, each zone is divided into latitude bands but these are not needed
-to specify the projection for most cases.
+are 6° (in longitude) wide. Each of these UTM zones have their unique central
+meridian. Furthermore, each zone is divided into latitude bands but these are
+not needed to specify the projection for most cases.
 
 In order to minimize the distortion in any given zone, a scale factor of 0.9996
 has been factored into the formulae. This makes the UTM projection a secant
 projection and not a tangent projection like the transverse Mercator above. The
 scale only varies by 1 part in 1,000 from true scale at equator. The
 ellipsoidal projection expressions are accurate for map areas that extend less
-than 10 away from the central meridian.
+than 10° away from the central meridian.
 
 **u**\ *zone/scale* or **U**\ *zone/width*
 
-the projection is set with **u** or **U**. *zone* sets the zone for the figure,
+The projection is set with **u** or **U**. *zone* sets the zone for the figure,
 and the figure size is set with *scale* or *width*.
 """
 import pygmt