Formatted all pages according to guidelines.

pages/common/parallel.md

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 # GNU Parallel
 
-> Run commands on multiple CPU cores
+> Run commands on multiple CPU cores.
 
-- gzip several files at once, using all cores
+- Gzip several files at once, using all cores:
 
 `parallel gzip ::: {{file1}} {{file2}} {{file3}}`
 
-- read arguments from stdin, run 4 jobs at once
+- Read arguments from stdin, run 4 jobs at once:
 
 `ls *.txt | parallel -j4 gzip`
 
-- Convert JPG images to PNG using replacement strings
+- Convert JPG images to PNG using replacement strings:
 
 `parallel convert {} {.}.png ::: *.jpg`
 
-- parallel xargs, cram as many args as possible onto one command
+- Parallel xargs, cram as many args as possible onto one command:
 
 `{{args}} | parallel -X {{command}}`
 
-- break stdin into ~1M blocks, feed each block to stdin of new command
+- Break stdin into ~1M blocks, feed each block to stdin of new command:
 
 `cat {{bigfile.txt}} | parallel --pipe --block 1M {{command}}`
 
-- run on multiple machines via SSH
+- Run on multiple machines via SSH:
 
 `parallel -S {{machine1}},{{machine2}} {{command}} ::: {{arg1}} {{arg2}}`