Answered from your documents
“How many days of leave can I carry over?”
From the leave policy in the handbook, with the file shown as its source.
“How do I claim back a train ticket?”
From the expenses section, step by step.
“How do I set up email on my phone?”
From the IT setup guide you added as a Word file.
“When does the office close for the holidays?”
From a written answer HR added once, used first every time.