[Hotfix][Examples] fix a Javadoc of a preformated text in JavaSimpleParamsExample

[yu-iskw]

No description provided.

[SparkQA]

Test build #38620 has finished for PR 7708 at commit 35f4430.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[vanzin]

Hi,

Since this is not fixing a build break, "hotfix" doesn't really apply. Otherwise, looks straight-forward enough.

[srowen]

Agree, this is not a fix. The modern way to write code javadoc is ...

{@code
val foo = ...
}

... but for consistency with other javadoc this is good enough.

[yu-iskw]

@srowen how about changing all the <pre> to {@code...}?

[srowen]

Hm, I do see many more uses of {@code } in the project than <pre> for this purpose, which is good. It would be reasonable to fix, at least, all the Java examples in one go here. Or, even fix all 14 instances I see in the code at once, everywhere. If so, make a JIRA please.

[yu-iskw]

Alright. I'll create a JIRA to change all <pre> to {@code...}. I'll send another PR later. Thanks!