Update GMT argument in the miscellaneous projections gallery to doc standards (#790)

* Update doc string for misc_eckertIV.py
* Update doc string for misc_eckertVI.py
* Update doc string for misc_hammer.py
* Update doc string for misc_mollweide.py
* Update doc string for misc_robinson.py
* Update doc string for misc_sinusoidal.py
* Update doc string for misc_van_der_grinten.py
* Update doc string for misc_winkel_tripel.py

Author: willschlitzer

examples/projections/cyl/cyl_stereographic.py

@@ -12,6 +12,7 @@
 
 **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*.
 

examples/projections/misc/misc_eckertIV.py

@@ -7,8 +7,10 @@
 meridian and all parallels are straight lines; other meridians are equally spaced
 elliptical arcs. The scale is true along latitude 40°30’.
 
-``Kf[central meridian]/width``: Give the optional central meridian (default is the
-center of the region) and the map width.
+**kf**\ [*lon0/*]\ *scale* or **Kf**\ [*lon0/*]\ *width*
+
+The projection is set with **kf** or **Kf**. The central meridian is set with the
+optional *lon0*, and the figure size is set with *scale* or *width*.
 """
 import pygmt
 

examples/projections/misc/misc_eckertVI.py

@@ -7,8 +7,11 @@
 Central meridian and all parallels are straight lines; other meridians are equally
 spaced sinusoids. The scale is true along latitude 49°16’.
 
-``Ks[central meridian]/width``: Give the optional central meridian (default is the
-center of the region) and the map width.
+
+**ks**\ [*lon0/*]\ *scale* or **Ks**\ [*lon0/*]\ *width*
+
+The projection is set with **ks** or **Ks**. The central meridian is set with the
+optional *lon0*, and the figure size is set with *scale* or *width*.
 """
 import pygmt
 

examples/projections/misc/misc_hammer.py

@@ -7,8 +7,10 @@
 similar, but is not equal-area). The border is an ellipse, equator and central
 meridian are straight lines, while other parallels and meridians are complex curves.
 
-``H[central meridian]/width``: Give the optional central meridian (default is the center
-of the region) and the map width.
+**h**\ [*lon0/*]\ *scale* or **H**\ [*lon0/*]\ *width*
+
+The projection is set with **h** or **H**. The central meridian is set with the
+optional *lon0*, and the figure size is set with *scale* or *width*.
 """
 import pygmt
 

examples/projections/misc/misc_mollweide.py

@@ -9,8 +9,10 @@
 mainly for global maps showing data distributions. It is occasionally referenced under
 the name homalographic projection.
 
-``W[central meridian]/width``: Give the optional central meridian (default is the center
-of the region) and the map width.
+**w**\ [*lon0/*]\ *scale* or **W**\ [*lon0/*]\ *width*
+
+The projection is set with **w** or **W**. The central meridian is set with the
+optional *lon0*, and the figure size is set with *scale* or *width*.
 """
 import pygmt
 

examples/projections/misc/misc_robinson.py

@@ -10,8 +10,10 @@
 originally developed for use by Rand McNally and is currently used by the
 National Geographic Society.
 
-``N[central meridian]/width``: Give the optional central meridian (default is the center
-of the region) and the map width.
+**n**\ [*lon0/*]\ *scale* or **N**\ [*lon0/*]\ *width*
+
+The projection is set with **n** or **N**. The central meridian is set with the
+optional *lon0*, and the figure size is set with *scale* or *width*.
 """
 import pygmt
 

examples/projections/misc/misc_sinusoidal.py

@@ -8,8 +8,10 @@
 meridians are sinusoidal curves. Parallels are all equally spaced straight lines, with
 scale being true along all parallels (and central meridian).
 
-``I[central meridian]/width``: Give the optional central meridian (default is the center
-of the region) and the map width.
+**i**\ [*lon0/*]\ *scale* or **I**\ [*lon0/*]\ *width*
+
+The projection is set with **i** or **I**. The central meridian is set with the
+optional *lon0*, and the figure size is set with *scale* or *width*.
 """
 import pygmt
 

examples/projections/misc/misc_van_der_grinten.py

@@ -7,8 +7,10 @@
 other meridians are arcs of circles. The scale is true along the Equator only. Its
 main use is to show the entire world enclosed in a circle.
 
-``V[central meridian]/width``: Give the optional central meridian (default is the center
-of the region) and the map width.
+**v**\ [*lon0/*]\ *scale* or **V**\ [*lon0/*]\ *width*
+
+The projection is set with **v** or **V**. The central meridian is set with the
+optional *lon0*, and the figure size is set with *scale* or *width*.
 """
 import pygmt
 

examples/projections/misc/misc_winkel_tripel.py

@@ -16,8 +16,10 @@
 (not Hammer-Aitoff) projections. The poles map into straight lines 0.4 times the
 length of equator.
 
-``R[central meridian]/width``: Give the optional central meridian (default is the center
-of the region) and the map width.
+**r**\ [*lon0/*]\ *scale* or **R**\ [*lon0/*]\ *width*
+
+The projection is set with **r** or **R**. The central meridian is set with the
+optional *lon0*, and the figure size is set with *scale* or *width*.
 """
 import pygmt