fix: add missing spaces

[bagmeg]

What this PR does / why we need it: This PR adds missing spaces to mongo values section on /getting-started/installation page.

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer:

Checklist:

• [ ] Fixes #
• [ ] Signed the commit for DCO to be passed
• [ ] Labelled this PR & related issue with documentation tag

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[namkyu1999]

Hi @bagmeg, Can you also make a change to this file?

[bagmeg]

Hi @bagmeg, Can you also make a change to this file?

sure, I'll make change and push again. thanks for the feedback