Tweak to bash and zsh scripts.

proposals/prompts-data/shell-integration.bash

-#source /home/bothner/DomTerm/tools/bash-preexec.sh
-thisfile="$BASH_SOURCE"
-case "$thisfile" in
-  "") echo "installation error - can't find path to $0"; exit -1 ;;
-  /*) ;;
-  *) thisfile="$PWD/$thisfile"  ;;
-esac
-while test -L "$thisfile"; do thisfile=$(readlink -f "$thisfile"); done
-source `dirname "$thisfile"`/bash-preexec.sh
-
 _prompt_executing=""
 function __prompt_precmd() {
     local ret="$?"

proposals/prompts-data/shell-integration.zsh

-#PS1='\[\e]133;P\a\]'$PS1'\[\e]133;B\a\e]122;> \a\]'
-#PS1='\[\e]133]A;repaint;aid='"$BASHPID"'\a\e]133;P\a\]'$PS1'\[\e]133;B\a\e]122;> \a\]'
-
 _prompt_executing=""
 function __prompt_precmd() {
     local ret="$?"

proposals/semantic-prompts.md

@@ -326,9 +326,10 @@ it doesn't have a way to specify a marker.
 ## Bash shell
 
 If you use [the Bourne-Again SHell (bash)](https://www.gnu.org/software/bash/)
-use [this initialization script](./prompts-data/shell-integration.bash).
+`source` [this initialization script](./prompts-data/shell-integration.bash).
 It depends on the [bash-preexec.sh script](./prompts-data/bash-preexec.sh)
-from [this site](https://github.com/rcaloras/bash-preexec).
+from [this site](https://github.com/rcaloras/bash-preexec),
+which you should `source` first.
 
 Bash has very limited support for multi-line input editing.