fix: Typo `seach` corrected to `search`

[dotWee]

Fixed the FHIR VZD documentation typo to enhance readability and maintain consistency across sections.

Fixed the directory name ./samples/FHIRseach to ./samples/FHIRsearch. Made sure to have git detect the moved documents, to make sure the links stay available.

GitHub should also detect the moved files and redirect to the moved files when going back in the git log.

Relevant commands:

• Find all files containing the typo seach: grep -r -F "seach" .
• Find and fix the typo in a file: sed 's/seach/search/g'