message: Fix string comparisons in documentation
  The builtin test command expects `=` for string comparisons, not `-eq`
diff: @@ -24,7 +24,7 @@ builtin, which may be convenient to use in conjuction with other commands in ord
  the exit status; and a `matches` builtin that performs a regex-based boolean match.
  ```sh
  -if test "foo" -eq $foo
  +if test "foo" = $foo
  echo "Found foo"
  else if matches $foo '[A-Ma-m]\w+'
  echo "we found a word that starts with A-M"
  @@ -72,7 +72,7 @@ can be skipped over and conditionally-executed based on return status. This enab
  expressing some patterns better than could be done with an if statement.
  ```ion
  -if test $foo -eq "foo" && test $bar -eq "bar"
  +if test $foo = "foo" && test $bar = "bar"
  echo "foobar was found"
  else
  echo "either foo or bar was not found"
  @@ -80,7 +80,7 @@ end
  ```
  ```ion
  -test $foo -eq "foo" && test $bar -eq "bar" &&
  +test $foo = "foo" && test $bar = "bar" &&
  echo "foobar was found" ||
  echo "either foo or bar was not found"
  ```
  