docs: document set -e/errexit and : null command in deno task shell#3153
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The deno task shell picked up two POSIX features in 2.8 that weren't reflected
in the docs: set -e / set -o errexit (with set +e to turn it back off) aborts a
sequential list on the first non-zero exit, and : is now a built-in null
command. Both are useful when porting shell scripts into tasks blocks without
falling back to sh -c. Adds errexit to the shell options list with an example
and lists : alongside the other built-in commands.