Install routine in "Vanilla Spark on your Local Machine" is outdated

[KrisSimon]

In the videos there is adoptopenjdk8 mentioned. That package is no longer available in brew. The version we have is: 16.0.1.

• Check if it works with the current version of java
• If so: place a hint on the page.
• If not: update the chapter to work with current versions of java

[syed-tw]

[syed-tw]

fixed