doc/guides: Extend STM32 Flashing Guide with OpenOCD and WSL Remark #21794
+37
−7
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Contribution description
While working on #21775, #21776 I noticed that OpenOCD can be a bit of a hassle, so I added some information with the two error messages that cost me a lot of time to the Flashing guide 😅
Testing procedure
Make sure that the guide properly renders and shows the additional information (or look at the screenshot below).

Issues/PRs references
Relieve a bit of the pain of #21781 🤣