DOC: Add warnings about removing grids from wheels and dropping manylinux1 wheels

Author: snowman2

docs/index.rst

@@ -3,11 +3,17 @@ pyproj Documentation
 
 Python interface to  `PROJ <https://proj.org/>`_ (cartographic projections and coordinate transformations library).
 
+GitHub Repository: https://github.com/pyproj4/pyproj
+
 .. note:: Minimum supported PROJ version is 7.2.0
 
 .. note:: Minimum supported Python version is 3.6
 
-GitHub Repository: https://github.com/pyproj4/pyproj
+.. warning:: pyproj 3 wheels do not include transformation grids.
+             For migration assistance see: :ref:`transformation_grids`
+
+.. warning:: pyproj 3+ no longer supports manylinux1 wheels.
+             pip>=19.0 is required to install manylinux2010 wheels.
 
 
 .. toctree::

docs/installation.rst

@@ -12,7 +12,12 @@ The easiest methods for installing pyproj are:
 
       pip install pyproj
 
-  .. note:: pip>=19.0 is required to install manylinux2010 wheels
+  .. warning:: pyproj 3+ no longer supports manylinux1 wheels.
+               pip>=19.0 is required to install manylinux2010 wheels.
+
+  .. warning:: pyproj 3+ wheels do not include transformation grids.
+               For migration assistance see: :ref:`transformation_grids`
+
 
   - The MacOS and Linux wheels are powered by `multibuild by Matthew Brett <https://github.com/matthew-brett/multibuild>`__
   - The Windows wheels are built by `Christoph Gohlke <https://www.lfd.uci.edu/~gohlke/pythonlibs/>`__

docs/transformation_grids.rst

@@ -11,7 +11,7 @@ documentation.
 
 `pyproj` API for managing the :ref:`data_directory` and :ref:`network`.
 
-.. warning:: pyproj 2 includes datumgrid 1.8 in the wheels. pyproj 3 will not include any datum grids.
+.. warning:: pyproj 3 wheels do not include any transformation grids.
 
 
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