articles/pipe.md: update

articles/pipe.md

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 # Pipe
 A pipe is an unidirectional IPC mechanism used first in the [Unix](unix.md) operating system, used to connect one
-or multiple processes (then forming a pipeline). Pipes are a central concept in Unix-like operating systems as it
+or multiple processes together (then forming a pipeline). Pipes are a central concept in Unix-like operating systems as it
 allows the composition of multiple programs results without using temporary files.
 
 In a shell a pipeline is constructed using the `|` character which by default redirect the process stdout
 output to the stdin of the process at the right of the pipe.
 ```sh
-A | B | C | D
+cmdA | cmdB | cmdC | cmdD
 ```
 
 ## Named pipes
 A named pipe also known as a FIFO, is a pipe that is represented as a file on a disk having similar semantics
 to a regular file.
 ```sh
-mkfifo foo
-cat foo &
-echo 'test' > foo
+mkfifo foo              # create named pipe
+cat foo &               # will block until something is written to it
+echo 'test' > foo       # send data through the pipe
 ```