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External references such as API reference guides

From my understanding, the Spanner JDBC can use all connection properties found in java-spanner ConnectionProperties.java file given the JDBC driver has the version that added the property.

When reading through the Java Spanner JDBC code, I believed that the list in the README.md was exhaustive (in addition it is not apparent to search out java-spanner repository to go thru that code as well), which caused me to make some coding decisions that were not optimal, when in reality I could've just used a connection property to solve my issue.