strings: remove redundant "runs" from string.Fields docstring

Change-Id: I502b24af186fc56fe953acf7ab7d29f8eefb9c07
GitHub-Last-Rev: 1a4edf4
GitHub-Pull-Request: #75156
Reviewed-on: https://go-review.googlesource.com/c/go/+/699215
Reviewed-by: Sean Liao <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Carlos Amedee <[email protected]>
Auto-Submit: Sean Liao <[email protected]>
Reviewed-by: Florian Lehner <[email protected]>
Reviewed-by: Cherry Mui <[email protected]>

Author: bradcypert

src/strings/strings.go

@@ -379,7 +379,7 @@ var asciiSpace = [256]uint8{'\t': 1, '\n': 1, '\v': 1, '\f': 1, '\r': 1, ' ': 1}
 // Fields splits the string s around each instance of one or more consecutive white space
 // characters, as defined by [unicode.IsSpace], returning a slice of substrings of s or an
 // empty slice if s contains only white space. Every element of the returned slice is
-// non-empty. Unlike [Split], leading and trailing runs runs of white space characters
+// non-empty. Unlike [Split], leading and trailing runs of white space characters
 // are discarded.
 func Fields(s string) []string {
 	// First count the fields.