Update GMT argument in the cylindric projections gallery to doc standards (#789)

* Update doc string for cyl_cassini.py
* Updating doc string for cyl_equal_area.py
* Updating doc string for cyl_equidistant.py
* Updating doc string for cyl_mercator.py
* Updating doc string for cyl_miller.py
* Update doc string for cyl_stereographic.py
* Update doc string for cyl_transverse_mercator.py
* Update doc string for cyl_universal_transverse_mercator.py

Co-authored-by: Dongdong Tian <[email protected]>

Author: willschlitzer

examples/projections/cyl/cyl_cassini.py

@@ -11,7 +11,10 @@
 meridian, each meridian 90° away, and equator are straight lines; all other meridians
 and parallels are complex curves.
 
-``Clon0/lat0/width``: ``lon0`` and ``lat0`` specifies the projection center.
+**c**\ *lon0/lat0*\ */scale* or **C**\ *lon0/lat0*\ */width*
+
+The projection is set with **c** or **C**. The projection center is set by *lon0/lat0*,
+and the figure size is set with *scale* or *width*.
 """
 import pygmt
 

examples/projections/cyl/cyl_equal_area.py

@@ -6,8 +6,10 @@
 latitude is selected as the standard parallel. However, they are all equal area and
 hence non-conformal. All meridians and parallels are straight lines.
 
-``Ylon0/lat0/width``: Give central meridian ``lon0``, the standard parallel ``lat0``,
-and the figure ``width``.
+**y**\ *lon0/lat0*\ */scale* or **Y**\ *lon0/lat0*\ */width*
+
+The projection is set with **y** or **Y**. The projection center is set by *lon0/lat0*,
+and the figure size is set with *scale* or *width*.
 """
 import pygmt
 

examples/projections/cyl/cyl_equidistant.py

@@ -6,7 +6,10 @@
 latitudes. The most common form is the Plate Carrée projection, where the scaling of
 longitudes and latitudes is the same. All meridians and parallels are straight lines.
 
-``Qwidth``: Give the figure ``width``.
+**q**\ *scale* or **Q**\ *width*
+
+The projection is set with **q** or **Q**, and the figure size is set
+with *scale* or *width*.
 """
 import pygmt
 

examples/projections/cyl/cyl_mercator.py

@@ -12,8 +12,11 @@
 extensively for world maps in which the distortion towards the polar regions grows
 rather large.
 
-``M[lon0/][lat0/]width``: Give central meridian ``lon0`` (optional) and
-standard parallel ``lat0`` (optional).
+**m**\ [*lon0[/lat0]*]\ */scale* or **M**\ [*lon0*][*/lat0*]\ */width*
+
+The projection is set with **m** or **M**. The central meridian is set with the
+option *lon0* and the standard parallel is set with the option *lat0*.
+The figure size is set with *scale* or *width*.
 """
 import pygmt
 

examples/projections/cyl/cyl_miller.py

@@ -9,7 +9,10 @@
 by using Mercator’s formula with 0.8 times the actual latitude, thus avoiding the
 singular poles; the result was then divided by 0.8.
 
-``J[lon0/]width``: Give the optional central meridian ``lon0`` and the figure ``width``.
+**j**\ [*lon0/*]\ */scale* or **J**\ [*lon0/*]\ */width*
+
+The projection is set with **j** or **J**. The central meridian is set by the
+optional *lon0*, and the figure size is set with *scale* or *width*.
 """
 import pygmt
 

examples/projections/cyl/cyl_stereographic.py

@@ -10,9 +10,12 @@
 antipodal point on the equator. The cylinder crosses the sphere at two standard
 parallels, equidistant from the equator.
 
-``Cyl_stere/[lon0/][lat0/]width``: Give central meridian ``lon0`` (optional) and
-standard parallel ``lat0`` (optional). The standard parallel is typically one of these
-(but can be any value):
+**cyl_stere/**\ [*lon0/*]\ [*lat0/*]\ *scale*
+or **Cyl_stere/**\ [*lon0/*]\ [*lat0/*]\ *width*
+The projection is set with **cyl_stere** or **Cyl_stere**. The central meridian is set
+by the optional *lon0*, and the figure size is set with *scale* or *width*.
+
+The standard parallel is typically one of these (but can be any value):
 
 * 66.159467 - Miller's modified Gall
 * 55 - Kamenetskiy's First

examples/projections/cyl/cyl_transverse_mercator.py

@@ -8,8 +8,11 @@
 center. The central meridian, each meridian 90° away from the center, and equator are
 straight lines; other parallels and meridians are complex curves.
 
-``T[lon0/][lat0/]width``: Give central meridian ``lon0``, the latitude of the
-origin ``lat0`` (optional), and the figure width.
+**t**\ *lon0/*\ [*lat0/*\ ]\ *scale* or **T**\ *lon0/*\ [*lat0/*\ ]\ *width*
+
+The projection is set with **t** or **T**. The central meridian is set
+by  *lon0*, the latitude of the origin is set by the optional *lat0*, and the figure
+size is set with *scale* or *width*.
 """
 import pygmt
 

examples/projections/cyl/cyl_universal_transverse_mercator.py

@@ -14,7 +14,10 @@
 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.
 
-``U[UTM Zone/][lat0/]width``: Give UTM Zone ``UTM Zone``, and the figure width.
+**u**\ *zone/scale* or **U**\ *zone/width*
+
+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