Update examples documentation

[evgueni-ovtchinnikov]

Changes in this pull request

Updates README.md in example scripts folders and respective wiki pages.

Testing performed

Related issues

Fixes #1134.

Checklist before requesting a review

• I have performed a self-review of my code
• I have added docstrings/doxygen in line with the guidance in the developer guide
• I have implemented unit tests that cover any new or modified functionality
• The code builds and runs on my machine
• CHANGES.md has been updated with any functionality change

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Please tick the following:

• The content of this Pull Request (the Contribution) is intentionally submitted for inclusion in SIRF (the Work) under the terms and conditions of the Apache-2.0 License.

[KrisThielemans]

Thanks! I've made some changes by moving things around a bit, and cross-referencing.

I've moved the note on Windows paths (\ vs /) to the main README, but currently commented out, as I don't know if that's still the case.

I guess you'll complete the list of descriptions of each demo?