Update open_abap.md

Author: oblomov-dev

docs/advanced/tools/open_abap.md

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 # open-abap
 
-abap2UI5 uses [open-abap](https://github.com/open-abap) to run unit tests, perform frontend testing, and run samples directly in your browser—without needing a backend.
+abap2UI5 uses [open-abap](https://github.com/open-abap) to run unit tests, perform frontend testing, and run samples directly in your browser — without needing a backend.