Adjust titles of Oblique Mercator projection examples (#2033)

Author: yvonnefroehlich

examples/projections/cyl/cyl_oblique_mercator_1.py

@@ -1,6 +1,6 @@
 r"""
-Oblique Mercator
-================
+Oblique Mercator, 1: origin and azimuth
+=======================================
 
 Oblique configurations of the cylinder give rise to the oblique Mercator
 projection. It is particularly useful when mapping regions of large lateral

examples/projections/cyl/cyl_oblique_mercator_2.py

@@ -1,6 +1,6 @@
 r"""
-Oblique Mercator
-================
+Oblique Mercator, 2: two points
+===============================
 
 Oblique configurations of the cylinder give rise to the oblique Mercator
 projection. It is particularly useful when mapping regions of large lateral

examples/projections/cyl/cyl_oblique_mercator_3.py

@@ -1,6 +1,6 @@
 r"""
-Oblique Mercator
-================
+Oblique Mercator, 3: origin and pole
+====================================
 
 Oblique configurations of the cylinder give rise to the oblique Mercator
 projection. It is particularly useful when mapping regions of large lateral

examples/projections/table/README.txt

@@ -54,7 +54,7 @@ The below table shows the projection codes for the 31 GMT projections.
    * - **N**\ [|lon0|/]\ *width*
      - :doc:`Robinson </projections/misc/misc_robinson>`
    * - **Oa**\ |lon0|/|lat0|/\ *azim*/*width*\ [**+v**]
-     - :doc:`Oblique Mercator, 1: origin and azim </projections/cyl/cyl_oblique_mercator_1>`
+     - :doc:`Oblique Mercator, 1: origin and azimuth </projections/cyl/cyl_oblique_mercator_1>`
    * - **Ob**\ |lon0|/|lat0|/|lon1|/|lat1|/\ *width*\ [**+v**]
      - :doc:`Oblique Mercator, 2: two points </projections/cyl/cyl_oblique_mercator_2>`
    * - **Oc**\ |lon0|/|lat0|/|lonp|/|latp|/\ *width*\ [**+v**]