Remove (final) duplicate 'the' words across docs

Author: sadielbartholomew

docs/source/field_analysis.rst

@@ -2221,7 +2221,7 @@ cell sizes (or custom weights) may applied to the calculation.
 
 .. code-block:: python
    :caption: *Calculate a 3-point weighted mean of the 'X' axis. Since
-             the the 'X' axis is cyclic, the mean wraps by default.*
+             the 'X' axis is cyclic, the mean wraps by default.*
 
    >>> q, t = cf.read('file.nc')
    >>> print(q)
@@ -2292,7 +2292,7 @@ filter. Convolution filters are carried with the
 
 .. code-block:: python
    :caption: *Calculate a 5-point mean of the 'X' axis with a
-             non-uniform window function. Since the the 'X' axis is
+             non-uniform window function. Since the 'X' axis is
              cyclic, the convolution wraps by default.*
 
    >>> print(q)

docs/source/introduction.rst

@@ -271,7 +271,7 @@ all of its metadata. It is defined in CF-|version| as follows:
 
 .. figure:: images/cfdm_field.svg
 
-   *The constructs of the CF data model described using UML. The field construct corresponds to a CF-netCDF data variable. The domain construct provides the linkage between the field construct and the constructs which describe measurement locations and cell properties. It is useful to define an abstract generic coordinate construct that can be used to refer to coordinates when the their type (dimension or auxiliary coordinate construct) is not an issue.*
+   *The constructs of the CF data model described using UML. The field construct corresponds to a CF-netCDF data variable. The domain construct provides the linkage between the field construct and the constructs which describe measurement locations and cell properties. It is useful to define an abstract generic coordinate construct that can be used to refer to coordinates when their type (dimension or auxiliary coordinate construct) is not an issue.*
 
 ----
 

docs/source/tutorial.rst

@@ -2545,7 +2545,7 @@ grid point location for each cell. The cell bounds are stored in a
 `~Coordinate.bounds` attribute, or `~Coordinate.get_bounds` method, of
 the coordinate construct.
 
-A `cf.Bounds` instance shares the :ref:`the same API as the field
+A `cf.Bounds` instance shares :ref:`the same API as the field
 construct <Data>` for accessing its data.
 
 .. code-block:: python
@@ -7064,7 +7064,7 @@ adding new ones, is straight forward with the
 Note that some STASH codes have multiple standard name mappings. This
 could be due to the standard name being a function of other parts of
 the header (as is the case for ``(1, 2)``) and ``(1, 152)``), or the
-the STASH code only being valid for particular UM versions (as is the
+STASH code only being valid for particular UM versions (as is the
 case for ``(1, 152)``).
 
 ----