Search notes:

Documentation/

Common file types

Commonly found file types below Documentation include .txt, .rst and .yaml.
The exact number can be determined like so (executed in August 2023): 
find . -type f | awk -F/ '{split($NF, a, "."); if (length(a) > 1) print a[length(a)]; else print "<no extension>"}' | sort | uniq -c | sort -n
   … several rare filetypes omitted for brevity …
      9 sh
     15 py
     17 dot
     74 svg
    615 <no extension>
   1707 txt
   3298 rst
   3604 yaml

See also

Linux kernel sources: Documentation
Linux kernel source tree

Index

Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php:78 Stack trace: #0 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(78): PDOStatement->execute(Array) #1 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(30): insert_webrequest_('/notes/Linux/ke...', 1738278857, '3.147.47.50', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/Linux/kernel/source/Documentation/index(55): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78