pw_doctor: Remove Pigweed branding

This removes an instance of the Pigweed name from the environment setup
process, to better facilitate whitelabelling Pigweed.

Change-Id: Ia444b854dce9c87eaa95551c55dda98d2dea6ae0
diff --git a/pw_doctor/py/pw_doctor/doctor.py b/pw_doctor/py/pw_doctor/doctor.py
index 7421c0a..b013636 100755
--- a/pw_doctor/py/pw_doctor/doctor.py
+++ b/pw_doctor/py/pw_doctor/doctor.py
@@ -259,7 +259,7 @@
     if ctx.failures:
         ctx.info('Failed checks: %s', ', '.join(ctx.failures))
     else:
-        ctx.info('Pigweed environment passes all checks!')
+        ctx.info('Environment passes all checks!')
     return len(ctx.failures)