[Term Entry] Java Math Methods: `.round()`

[Dusch4593]

Reason/inspiration (optional)

Under the "Java: Math Methods" concept, create a new term entry for the Math.round() method. Be sure to include the following sections:

• A "Syntax" section with a ```pseudo code snippet that describes how to apply the parameter(s), if any.
• An "Example" section with a ```java code snippet that demonstrates the Math.round() method.

Please refer to the entry templates, content standards, and markdown style guide when working on the PR for this issue.

Entry Type (select all that apply)

New Term for Existing Concept Entry

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