Tweak troubleshooting section to make it easier to read and also ment…

…ion that

restarting the command prompt is necessary on Windows when environment
variables have been changed.

doc/src/installation.rst

@@ -180,15 +180,21 @@ If installation fails:
 If importing cx_Oracle fails:
 
     - Do you get the error "``DPI-1047: Oracle Client library cannot be
-      loaded``"? Check the ``PATH`` environment variable on Windows or the
-      ``LD_LIBRARY_PATH`` environment variable on Linux. On macOS, make sure
-      Oracle Instant Client is in `~/lib` or `/usr/local/lib` and that you are
-      not using the bundled Python (use `Homebrew <https://brew.sh>`__ or
-      `Python.org <https://www.python.org/downloads>`__ instead). Check that
-      Python, cx_Oracle and your Oracle Client libraries are all 64-bit or all
-      32-bit. Check that the correct `Windows Redistributables
-      <https://oracle.github.io/odpi/doc/installation.html#windows>`__ have been
-      installed.
+      loaded``"?
+
+      - Check the ``PATH`` environment variable on Windows. Ensure that you
+        have restarted your command prompt if you have modified environment
+        variables.
+      - Check the ``LD_LIBRARY_PATH`` environment variable on Linux.
+      - On macOS, make sure Oracle Instant Client is in `~/lib` or
+        `/usr/local/lib` and that you are not using the bundled Python (use
+        `Homebrew <https://brew.sh>`__ or `Python.org
+        <https://www.python.org/downloads>`__ instead).
+      - Check that Python, cx_Oracle and your Oracle Client libraries are all
+        64-bit or all 32-bit.
+      - on Windows, check that the correct `Windows Redistributables
+        <https://oracle.github.io/odpi/doc/installation.html#windows>`__ have
+        been installed.
 
     - If you have both Python 2 and 3 installed, make sure you are
       using the correct python and pip (or python3 and pip3)