Update 06-manipulating-MARC-data-basics.md

[jenmawe]

removed RDA helper and Select records for edit. Added find, find all, and replace. fixes #110

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Rendered Changes

:mag: Inspect the changes: https://github.com/LibraryCarpentry/lc-marcedit/compare/md-outputs..md-outputs-PR-122

The following changes were observed in the rendered markdown documents:

 06-manipulating-MARC-data-basics.md | 125 ++++++++++++++++++------------------
 md5sum.txt                          |   2 +-
 2 files changed, 62 insertions(+), 65 deletions(-)

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:stopwatch: Updated at 2023-10-05 14:55:46 +0000

[jenmawe]

This also closes #101