Update cheatsheets

tldr/zstd

@@ -24,6 +24,10 @@ source: https://github.com/tldr-pages/tldr.git
 
 `zstd -{{level}} {{path/to/file}}`
 
+- Compress a file using an ultra-fast compression level, where 1=default:
+
+`zstd --fast={{level}} {{path/to/file}}`
+
 - Unlock higher compression levels (up to 22) using more memory (both for compression and decompression):
 
 `zstd --ultra -{{level}} {{path/to/file}}`