docs: invalid IMPORT_FILES, use IMPORT_FILES_LOCATIONS instead

[kamontat]

What this PR does / why we need it: fix typo on README

Special notes for your reviewer:

PR Readiness Checklist:

Complete these before marking the PR as ready to review:

• the CHANGELOG.md release notes have been updated to reflect any significant (and particularly user-facing) changes introduced by this PR

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov]

Codecov Report

Merging #900 (e203519) into main (34fe17f) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #900   +/-   ##
=========================================
  Coverage     95.50%   95.50%           
  Complexity     1322     1322           
=========================================
  Files            78       78           
  Lines          4270     4270           
  Branches        475      475           
=========================================
  Hits           4078     4078           
  Misses           91       91           
  Partials        101      101           

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