[#1377] DG: minor improvement to Setting Up section

[rolandyuwy]

Fixes #1377

To allow the setting up process to be more seamless, include a quick tip to find out the version of each prerequisite from the OS terminal.

Proposed commit message:

In the Setting Up section of the Developer Guide,
a hint is provided for checking the version of git,
but not for JDK or npm.

Let's provide hints for JDK and npm as well.

[damithc]

I think the proposed commit message can be shorter. Something along these lines?

In the .... a hint is provided for x but not for y and z.

Let's provide hints for y and z as well.

[Tejas2805]

LGTM!

[fzdy1914]

@rolandyuwy Can u modify the proposed message as pointed out by Prof?

[rolandyuwy]

@rolandyuwy Can u modify the proposed message as pointed out by Prof?

Changes to the proposed message have been made. Thank you!