remove stray comment

Signed-off-by: Brian L. Troutwine <brian.troutwine@datadoghq.com>

Author: blt

lading_payload/src/opentelemetry/metric.rs

@@ -38,7 +38,6 @@
 // * value: enum { u64, f64 } -- the value
 // * flags: uu32 -- I'm not sure what to make of this yet
 
-// tags module moved to common
 pub(crate) mod templates;
 pub(crate) mod unit;