cmd/list: Remove help text about -l displaying file sizes

- It doesn't work on the `HOMEBREW_CELLAR` dir for some reason, and
  using `du -sh` instead (PR 10131) was an extra call that we don't
  need.
- (I had to edit the man page manually as `brew man` gives me "Broken
  pipe" errors.)

Library/Homebrew/cmd/list.rb

@@ -48,8 +48,7 @@ module Homebrew
                           "This is the default when output is not to a terminal."
       switch "-l",
              depends_on:  "--formula",
-             description: "List formulae in long format. If the output is to a terminal, "\
-                          "a total sum for all the file sizes is printed before the long listing."
+             description: "List formulae in long format."
       switch "-r",
              depends_on:  "--formula",
              description: "Reverse the order of the formulae sort to list the oldest entries first."

docs/Manpage.md

@@ -339,7 +339,7 @@ If *`cask`* is provided, list its artifacts.
 * `-1`:
   Force output to be one entry per line. This is the default when output is not to a terminal.
 * `-l`:
-  List formulae in long format. If the output is to a terminal, a total sum for all the file sizes is printed before the long listing.
+  List formulae in long format.
 * `-r`:
   Reverse the order of the formulae sort to list the oldest entries first.
 * `-t`:

manpages/brew.1

@@ -468,7 +468,7 @@ Force output to be one entry per line\. This is the default when output is not t
 .
 .TP
 \fB\-l\fR
-List formulae in long format\. If the output is to a terminal, a total sum for all the file sizes is printed before the long listing\.
+List formulae in long format\.
 .
 .TP
 \fB\-r\fR