Update cheatsheets

tldr/base64

@@ -5,25 +5,25 @@ source: https://github.com/tldr-pages/tldr.git
 ---
 # base64
 
-> Encode or decode file or `stdin` to/from Base64, to `stdout`.
-> More information: <https://www.gnu.org/software/coreutils/base64>.
+> Encode or decode file or `stdin` to/from base64, to `stdout`.
+> More information: <https://manned.org/base64>.
 
-- Encode the contents of a file as base64 and write the result to `stdout`:
+- Encode a file:
 
 `base64 {{path/to/file}}`
 
 - Wrap encoded output at a specific width (`0` disables wrapping):
 
-`base64 --wrap {{0|76|...}} {{path/to/file}}`
+`base64 {{-w|--wrap}} {{0|76|...}} {{path/to/file}}`
 
-- Decode the base64 contents of a file and write the result to `stdout`:
+- Decode a file:
 
-`base64 --decode {{path/to/file}}`
+`base64 {{-d|--decode}} {{path/to/file}}`
 
 - Encode from `stdin`:
 
-`{{somecommand}} | base64`
+`{{command}} | base64`
 
 - Decode from `stdin`:
 
-`{{somecommand}} | base64 --decode`
+`{{command}} | base64 {{-d|--decode}}`