Fix incorrect reST syntax in the data_kind function (#3795)

pygmt/helpers/utils.py

@@ -204,8 +204,8 @@ def data_kind(
     r"""
     Check the kind of data that is provided to a module.
 
-    The argument passed to the ``data`` parameter can have any data type. The
-    following data kinds are recognized and returned as ``kind``:
+    The argument passed to the ``data`` parameter can have any data type. The following
+    data kinds are recognized and returned as ``kind``:
 
     - ``"arg"``: ``data`` is ``None`` and ``required=False``, or bool, int, float,
       representing an optional argument, used for dealing with optional virtual files
@@ -222,7 +222,7 @@ def data_kind(
       (e.g., :class:`numpy.ndarray`)
     - ``"vectors"``: any unrecognized data. Common data types include, a
       :class:`pandas.DataFrame` object, a dictionary with array-like values, a 1-D/3-D
-      :class:`numpy.ndarray` object, or array-like objects.
+      :class:`numpy.ndarray` object, or array-like objects
 
     Parameters
     ----------
@@ -280,12 +280,12 @@ def data_kind(
     >>> data_kind(data=xr.DataArray(np.random.rand(3, 4, 5)))  # 3-D xarray.DataArray
     'image'
 
-    The "stringio"`` kind:
+    The "stringio" kind:
 
     >>> data_kind(data=io.StringIO("TEXT1\nTEXT23\n"))
     'stringio'
 
-    The "matrix"`` kind:
+    The "matrix" kind:
 
     >>> data_kind(data=np.arange(10).reshape((5, 2)))  # 2-D numpy.ndarray
     'matrix'