docs: Fix a few typos

[timgates42]

There are small typos in:

• goose/init.py
• goose/configuration.py
• goose/extractors/content.py
• goose/extractors/title.py
• goose/text.py
• tests/extractors/images.py

Fixes:

• Should read method rather than methode.
• Should read language rather than languahe.
• Should read writable rather than writtable.
• Should read wonderful rather than wonderfull.
• Should read variable rather than valriable.
• Should read substantial rather than substatial.
• Should read siblings rather than sibilings.

Semi-automated pull request generated by https://github.com/timgates42/meticulous/blob/master/docs/NOTE.md