Prune commentary and stale Rust port notes

scripts/rigs/ui-profile/src/stats.rs

@@ -1,10 +1,5 @@
-//! The percentile and summary printing both rigs share, so two runs'
-//! output can be read side by side.
-
 use std::time::Duration;
 
-/// The `p`th percentile of `sorted`, in milliseconds. Sorts in place, so
-/// a caller keeping its samples passes a clone.
 pub fn pct(sorted: &mut [Duration], p: f64) -> f64 {
     if sorted.is_empty() {
         return 0.0;
@@ -14,9 +9,6 @@ pub fn pct(sorted: &mut [Duration], p: f64) -> f64 {
     sorted[i].as_secs_f64() * 1000.0
 }
 
-/// Half a 120Hz frame -- the budget these rigs judge a *CPU* sample
-/// against, since layer 1 measures only the build phase and a frame has
-/// to acquire and submit as well.
 pub const CPU_BUDGET: Duration = Duration::from_micros(8_333);
 
 pub fn summarise(name: &str, samples: &[Duration]) {
@@ -33,7 +25,6 @@ pub fn summarise(name: &str, samples: &[Duration]) {
     );
 }
 
-/// The percentile of a plain count (bytes, calls) rather than a duration.
 pub fn pct_u64(v: &mut [u64], p: f64) -> u64 {
     if v.is_empty() {
         return 0;