Update documentation

Author: jim-easterbrook

INSTALL.rst

@@ -49,8 +49,8 @@ See the piwheels site for more information.
 Dependencies
 ------------
 
-*   Python: http://python.org/ version 3.5 or greater
-*   libgphoto2: http://www.gphoto.org/proj/libgphoto2/ version 2.5.0 or greater
+*   Python: http://python.org/ version 3.6 or greater
+*   libgphoto2: http://www.gphoto.org/proj/libgphoto2/ version 2.5.10 or greater
 *   build tools: `pkg-config`_, C compiler & linker
 
 In most cases you should use your operating system's package manager to install these.
@@ -146,13 +146,13 @@ Omitting the parameter uses the system installation::
     $ python3 developer/build_swig.py
 
 This builds the interface for the version of libgphoto2_ installed on your computer.
-The interface files are created in directories with names like ``src/swig-gp2.5.18``.
+The interface files are created in directories with names like ``src/swig-gp2_5_18``.
 This naming scheme allows for different versions of libgphoto2_.
 The most appropriate version is chosen when the interface is built.
 
 As before, pip_ is used to build and install python-gphoto2::
 
-    $ GPHOTO2_ROOT=$HOME/.local pip3 install gphoto2 --user --no-binary :all:
+    $ GPHOTO2_ROOT=$HOME/.local pip3 install --user -v .
 
 Documentation
 -------------

developer/README.rst

@@ -1,7 +1,7 @@
 Notes for developers
 ====================
 
-The python interfaces can be built with any version of libgphoto2, but functions only present in later versions will not be accessible from python unless the interface is built with that later version. However, using this later version interface with an earlier version of libgphoto2 would normally result in undefined reference errors.
+The python interfaces can be built with any recent version of libgphoto2, but functions only present in later versions will not be accessible from python unless the interface is built with that later version. However, using this later version interface with an earlier version of libgphoto2 would normally result in undefined reference errors.
 
 The solution is to include definitions of new functions in the interface to replace the proper versions when building for an older version of libgphoto2. See the camera.i interface file for an example.
 
@@ -20,12 +20,12 @@ To build python-gphoto2 with a different version of libgphoto2 than the one inst
 
 Note the use of ``--prefix=$PWD/local_install`` to create a local copy, rather than a system installation.
 
-Now you can build and install a wheel that includes your local copy of the libgphoto2 libs::
+Now you can build and install a package that includes your local copy of the libgphoto2 libs::
 
-    GPHOTO2_ROOT=libgphoto2-2.5.28/local_install pip wheel . -v
-    pip install gphoto2-*.whl --user
+    GPHOTO2_ROOT=$PWD/libgphoto2-2.5.28/local_install pip install --user . -v
 
 The ``GPHOTO2_ROOT`` environment variable tells setup.py to use the files in libgphoto2-2.5.28/local_install.
+This value needs to be an absolute path.
 
 Tracking libgphoto2 releases
 ----------------------------