pygmt.grdclip: Fix a typo in doctest (#4117)

Author: seisman

pygmt/src/grdclip.py

@@ -98,7 +98,7 @@ def grdclip(
     -------
     >>> import pygmt
     >>> # Load the 30 arc-minutes Earth relief grid, with a longitude range of 10° E to
-    >>> 30° E, and a latitude range of 15° N to 25° N
+    >>> # 30° E, and a latitude range of 15° N to 25° N
     >>> grid = pygmt.datasets.load_earth_relief(
     ...     resolution="30m", region=[10, 30, 15, 25]
     ... )