internal/pkgbits: fix incorrect doc comment

Change-Id: I71d1dfec11657ffa8ffe12e87f6dbd65cbb1854b
Reviewed-on: https://go-review.googlesource.com/c/go/+/607475


Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
TryBot-Bypass: Robert Griesemer <gri@google.com>

src/internal/pkgbits/encoder.go

@@ -295,7 +295,7 @@ func (w *Encoder) Len(x int) { assert(x >= 0); w.Uint64(uint64(x)) }
 // Int encodes and writes an int value into the element bitstream.
 func (w *Encoder) Int(x int) { w.Int64(int64(x)) }
 
-// Len encodes and writes a uint value into the element bitstream.
+// Uint encodes and writes a uint value into the element bitstream.
 func (w *Encoder) Uint(x uint) { w.Uint64(uint64(x)) }
 
 // Reloc encodes and writes a relocation for the given (section,