Fix typos and refactor

[zrgt]

• Fixed grammar and typos
• Removed outdated reference to removed tutorial (Fixes tutorial_serialization_deserialization: Remove outdated reference to removed tutorial #282)
• Replaced mutable mutable default argument in `do_request() with None (Fixes basyx.backend.couchdb: Mutable default argument value in do_request() #342)
• Fixed wrong tag (Fixes basyx.adapter.xml: Wrong default tag for specificAssedId #341)
• Add a note about max line length exception (Fixes Codestyle: adapt line length to 72 characters instead of 120 #285)
• Log warning if no AAS files read within AASX package (Fixes Log a warning if no AAS files are read within an AASX package #247)

[Frosty2500]

LGTM, nice that you refactored/cleaned so much up 😄