truncate: add example (#6038)

pages/common/truncate.md

@@ -5,16 +5,20 @@
 
 - Set a size of 10 GB to an existing file, or create a new file with the specified size:
 
-`truncate -s {{10G}} {{filename}}`
+`truncate --size {{10G}} {{filename}}`
 
 - Extend the file size by 50M, fill with holes (which reads as zero bytes):
 
-`truncate -s +{{50M}} {{filename}}`
+`truncate --size +{{50M}} {{filename}}`
 
 - Shrink the file by 2GiB, by removing data from the end of file:
 
-`truncate -s -{{2G}} {{filename}}`
+`truncate --size -{{2G}} {{filename}}`
 
 - Empty the file's content:
 
-`truncate -s 0 {{filename}}`
+`truncate --size 0 {{filename}}`
+
+- Empty the file's content, but do not create the file if it does not exist:
+
+`truncate --no-create --size 0 {{filename}}`