docs: Update build.sh to indicate usage of multiple profiles

[aseques]

Clarify the usage of multiple profiles

Description

Clarify in the build script the usage of multiple profiles (mentioned here)

Please check if the PR fulfills these requirements

• [x ] The commit message follows our guidelines: https://docs.mapstore.geosolutionsgroup.com/en/latest/developer-guide/printing-module/#building-from-the-source
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ x ] Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x", remove the others)

• [ ] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, local variables)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] CI related changes
• [x ] Other... Please describe:

Simple documentation clarification

Issue

What is the current behavior?

The usage of commas to use multiple profiles is in the docs but a bit difficult to find

What is the new behavior? Usage explained within the code

Breaking change

Does this PR introduce a breaking change? (check one with "x", remove the other)

• [ ] Yes, and I documented them in migration notes
• [x] No

Other useful information