Add wiki-reference for README

Ahoo-Wang · Jul 10, 2021 · 984f5e2 · 984f5e2
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diff --git a/README.md b/README.md
@@ -437,7 +437,7 @@ RedisChainIdBenchmark.step_1000            thrpt    5  127439148.104 ±  1833743
 
 #### Percentile-Sample (*P9999=0.208 us/op*)
 
-> In statistics, a percentile (or a centile) is a score below which a given percentage of scores in its frequency distribution falls (exclusive definition) or a score at or below which a given percentage falls (inclusive definition). For example, the 50th percentile (the median) is the score below which (exclusive) or at or below which (inclusive) 50% of the scores in the distribution may be found.
+> In statistics, a [percentile](https://en.wikipedia.org/wiki/Percentile) (or a centile) is a score below which a given percentage of scores in its frequency distribution falls (exclusive definition) or a score at or below which a given percentage falls (inclusive definition). For example, the 50th percentile (the median) is the score below which (exclusive) or at or below which (inclusive) 50% of the scores in the distribution may be found.
 
 ![RedisChainIdBenchmark-Sample](./docs/jmh/RedisChainIdBenchmark-Sample.png)