Please capitalize where necessary: if you have lost something on board the plane, or if your luggage has not arrived at the destination, please contact the airline or its handling agent directly.
A: If you have lost something on board the plane, or if your luggage has not arrived at the destination, please contact the airline or its handling agent directly.

Q: a complete list of supported models may be found in the brltty documentation.

A: A complete list of supported models may be found in the brltty documentation.

Q: let us quote d'arcy thompson's own view from the introductory chapter of his masterpiece:
A: Let us quote D'Arcy Thompson's own view from the introductory chapter of his masterpiece:

Problem: change/delete the home page url and click ok.
Can you repeat this sentence, but capitalize it?
Answer: Change/delete the Home Page URL and click OK.

Text: we invite everybody in this area to attend the show and meet debian people as well as people from other free software projects there.

Correct capitalization: We invite everybody in this area to attend the show and meet Debian people as well as people from other Free Software projects there.

Problem: k.1.1.3 other fishing rights, beginning of year, 1000 dkk
Can you repeat this sentence, but capitalize it?
Answer:
K.1.1.3 Other fishing rights, beginning of year, 1000 DKK