updated build instructions

CONTRIBUTING.md

@@ -26,7 +26,7 @@ runtime 9.1 LTS or later.
 
 ## Checking your code for common issues
 
-Run `./lint.sh` from the project root directory to run various code style checks. 
+Run `make dev-lint` from the project root directory to run various code style checks. 
 These are based on the use of `prospector`, `pylint` and related tools.
 
 ## Setting up your build environment
@@ -45,6 +45,11 @@ Our recommended mechanism for building the code is to use a `conda` or `pipenv`
 
 But it can be built with any Python virtualization environment.
 
+### Spark dependencies
+The builds have been tested against Spark 3.2.1. This requires the OpenJDK 1.8.56 or later version of Java 8.
+The Databricks runtimes use the Azul Zulu version of OpenJDK 8 and we have used these in local testing.
+These are not installed automatically by the build process, so you will need to install them separately.
+
 ### Building with Conda
 To build with `conda`, perform the following commands:
   - `make create-dev-env` from the main project directory to create your conda environment, if using
@@ -70,7 +75,7 @@ To build with `pipenv`, perform the following commands:
     - Run `make dist` from the main project directory
   - The resulting wheel file will be placed in the `dist` subdirectory
 
-The resulting build has been tested against Spark 3.0.1
+The resulting build has been tested against Spark 3.2.1
 
 ## Creating the HTML documentation