docs: fix typos and grammar in launch-qemu-gdb.md

[kartheek0107]

• Fix 'counters' -> 'encounters' and 'in a later' -> 'at a later'
• Fix 'as with did' -> 'as we did'
• Remove duplicate '$' in console snippet
• Fix 'expose in the port' -> 'exposes port'
• Fix typo 'gbd' -> 'gdb'

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