docs(keymap/tutorial.kbd): fix typos and improve formatting

[trueNAHO]

• style(keymap/tutorial.kbd): wrap non-code text at 80 characters
• docs(keymap/tutorial.kbd): fix typos
  • The word is is used for singular subjects, while are is used for plural subjects. In this sentence, 2 represents a quantity greater than one, making it a plural subject. Using are instead of is ensures grammatical accuracy and clarity, maintaining subject-verb agreement.
• style(keymap/tutorial.kbd): add and remove empty lines
• style(keymap/tutorial.kbd): improve list formatting
• style(keymap/tutorial.kbd): use consistant formatting

[slotThe]

Thanks