pw_tokenizer: Fix doc reference to script

Fixes incorrect reference to script "detokenize_serial" to the correct
"serial_detokenizer" name.

Change-Id: I326b05867a81f598521291feb0eedd922289a7b9
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/45900
Reviewed-by: Ewout van Bekkum <ewout@google.com>
Pigweed-Auto-Submit: Ewout van Bekkum <ewout@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>

pw_tokenizer/docs.rst

diff --git a/pw_tokenizer/docs.rst b/pw_tokenizer/docs.rst
index a95ee5a..ce97862 100644
--- a/pw_tokenizer/docs.rst
+++ b/pw_tokenizer/docs.rst
@@ -915,7 +915,7 @@
 
 * ``detokenize.py`` -- Detokenizes Base64-encoded strings in files or from
   stdin.
-* ``detokenize_serial.py`` -- Detokenizes Base64-encoded strings from a
+* ``serial_detokenizer.py`` -- Detokenizes Base64-encoded strings from a
   connected serial device.
 
 If the ``pw_tokenizer`` Python package is installed, these tools may be executed
@@ -927,7 +927,7 @@
   python -m pw_tokenizer.detokenize -i input_file.txt
 
   # Detokenize Base64-encoded strings in output from a serial device
-  python -m pw_tokenizer.detokenize_serial --device /dev/ttyACM0
+  python -m pw_tokenizer.serial_detokenizer --device /dev/ttyACM0
 
 See the ``--help`` options for these tools for full usage information.