Apply suggestions from code review

I reviewed these suggestions, and appreciate the feedback! Thank you for the improvements.

Co-authored-by: Will Schlitzer <schlitzer90@gmail.com>

Author: eemcmullan

examples/projections/cyl/cyl_oblique_mercator_1.py

@@ -7,21 +7,25 @@
 extent in an oblique direction. Both parallels and meridians are complex
 curves. The projection was developed in the early 1900s by several workers.
 
-**oa**\ *lon0/lat0* */azimuth*\ */scale*\ **[+v]** or
-**OA**\ *lon0/lat0* */azimuth*\ */width*\ **[+v]** or
+**oa**\ |**oA**\ *lon0/lat0* */azimuth*\ */scale*\ **[+v]** or
+**Oa**\ |**OA**\ *lon0/lat0* */azimuth*\ */width*\ **[+v]** or
 
-The projection is set with **o** or **O**. The central meridian is set by
-*lon0/lat0*. The oblique equator is set by the azimuth. Align the y-axis
+The projection is set with **o** or **O**. The pole is set in the 
+northern hemisphere with **a** or the southern hemisphere 
+with **A**. The central meridian is set by *lon0/lat0*. The oblique equator 
+is set by the azimuth. Align the y-axis
 with the optional *+v*. The figure size is set with *scale* or *width*.
 """
 import pygmt
 
 fig = pygmt.Figure()
 # Using the origin and azimuth
 fig.coast(projection="Oa-120/25/-30/12c+v",
+    # Set bottom left and top right coordinates of the figure with "+r"
     region= "-122/35/-107/22+r",
     frame="afg",
     land="gray",
+    shorelines="1/thin",
     water="lightblue",
     )
 fig.show()

examples/projections/cyl/cyl_oblique_mercator_2.py

@@ -7,21 +7,25 @@
 extent in an oblique direction. Both parallels and meridians are complex
 curves. The projection was developed in the early 1900s by several workers.
 
-**ob**\ *lon0/lat0* */lon1/lat1*\ */scale*\ **[+v]** or
-**OB**\ *lon0/lat0* */lon1/lat1*\ */width*\ **[+v]** or
+**ob**\ |**oB**\ *lon0/lat0* */lon1/lat1*\ */scale*\ **[+v]** or
+**Ob**\ |**OB**\*lon0/lat0* */lon1/lat1*\ */width*\ **[+v]** or
 
-The projection is set with **o** or **O**. The central meridian is set by
-*lon0/lat0*. The oblique equator is set by *lon1/lat1*. Align the y-axis
+The projection is set with **o** or **O**. The pole is set in the 
+northern hemisphere with **b** or the southern hemisphere 
+with **B**. The central meridian is set by *lon0/lat0*. The oblique 
+equator is set by *lon1/lat1*. Align the y-axis
 with the optional *+v*. The figure size is set with *scale* or *width*.
 """
 import pygmt
 
 fig = pygmt.Figure()
 # Using the origin and two points
 fig.coast(projection="Ob130/35/25/35/12c",
+    # Set bottom left and top right coordinates of the figure with "+r"
     region= "130/35/145/40+r",
     frame="afg",
     land="gray",
+    shorelines="1/thin",
     water="lightblue",
     )
 fig.show()

examples/projections/cyl/cyl_oblique_mercator_3.py

@@ -7,8 +7,8 @@
 extent in an oblique direction. Both parallels and meridians are complex
 curves. The projection was developed in the early 1900s by several workers.
 
-**oc**\ *lon0/lat0* */lonp/latp*\ */scale*\ **[+v]** or
-**OC**\ *lon0/lat0* */lonp/latp*\ */width*\ **[+v]**
+**oc**\ |**oC**\ *lon0/lat0* */lonp/latp*\ */scale*\ **[+v]** or
+**Oc**\ |**OC**\ *lon0/lat0* */lonp/latp*\ */width*\ **[+v]**
 
 The projection is set with **o** or **O**. The central meridian is set
 by *lon0/lat0*. The projection pole is set by *lonp/latp* in option three.
@@ -20,9 +20,11 @@
 fig = pygmt.Figure()
 # Using the origin projection pole
 fig.coast(projection="Oc280/25.5/22/69/12c",
+    # Set bottom left and top right coordinates of the figure with "+r"
     region= "270/20/305/25+r",
     frame="afg",
     land="gray",
+    shorelines="1/thin",
     water="lightblue",
     )
 fig.show()