Apply suggestions from code review

Co-authored-by: Meghan Jones <[email protected]>

pygmt/src/basemap.py

@@ -52,7 +52,6 @@ def basemap(self, **kwargs):
  Parameters
  ----------
  {J}
- *Required if this is the first plot command.*
  zscale/zsize : float or str
  Set z-axis scaling or z-axis size.
  {R}

pygmt/src/coast.py

@@ -64,7 +64,6 @@ def coast(self, **kwargs):
  Parameters
  ----------
  {J}
- *Required if this is the first plot command.*
  {R}
  *Required if this is the first plot command.*
  {A}

pygmt/src/text.py

@@ -116,7 +116,6 @@ def text_(
  left. If no justification is explicitly given (i.e. ``justify=True``),
  then the input to ``textfiles`` must have this as a column.
  {J}
- *Required if this is the first plot command.*
  {R}
  *Required if this is the first plot command.*
  clearance : str