pages/*: add backticks around I/O streams (#10436)

* as suggested in #10428
* standard input  => `stdin`
* standard output => `stdout`
* standard error  => `stderr`

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/common/bzip2.md

@@ -11,7 +11,7 @@
 
 `bzip2 -d {{path/to/compressed_file.bz2}}`
 
-- Decompress a file to standard output:
+- Decompress a file to `stdout`:
 
 `bzip2 -dc {{path/to/compressed_file.bz2}}`