Update installation.md

[lkounadis]

describe your changes...

• Read and sign the CLA. PRs that haven't signed it won't be accepted.
• Make sure your PR complies with the writer's guide.
• Review the diff carefully as sometimes this can reveal issues.
• Remove these instructions from your PR as they are for your eyes only.

[jsf-clabot]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

[lkounadis]

I dont really agree with this because there are some (junior) devs who may not understand. thats why I wanted to elaborate on this, Since there is no other movement lets proceed with your change.

[EugeneHlushko]

I approve of this phrasing. Lets get another approving review because i have contributed to this and cant review something i wrote.

[montogeek]

Thanks!