Remove duplicate text from README.adoc of descriptor_indexing

[burak-efe]

Description

remove duplicate text

General Checklist:

Please ensure the following points are checked:

• [x] My code follows the coding style
• [x] I have reviewed file licenses
• [x] I have commented any added functions (in line with Doxygen)
• [x] I have commented any code that could be hard to understand
• [x] My changes do not add any new compiler warnings
• [x] My changes do not add any new validation layer errors or warnings
• [x] I have used existing framework/helper functions where possible
• [x] My changes do not add any regressions
• [x] I have tested every sample to ensure everything runs correctly

• [x] This PR describes the scope and expected impact of the changes I am making

  Note: The Samples CI runs a number of checks including:

  • [x] I have updated the header Copyright to reflect the current year (CI build will fail if Copyright is out of date)
  • [x] My changes build on Windows, Linux, macOS and Android. Otherwise I have documented any exceptions

  If this PR contains framework changes:

  • [ ] I did a full batch run using the batch command line argument to make sure all samples still work properly

[asuessenbach]

I think, you should mention the additional changes in .gitignore and std_filesystem.cpp in the Description section above. Or maybe just move them into a separate PR.

[SaschaWillems]

I second that. When I reviewed, it only had the documentation fix (which is fine). But a recent commit also changed code. Can you please revert that?

[burak-efe]

I second that. When I reviewed, it only had the documentation fix (which is fine). But a recent commit also changed code. Can you please revert that?

Oh my bad, I was planning these for another request, I reverted that. It should be good now, sorry about that.