Update readme.md

Author: javadev

src/main/java/g0001_0100/s0069_sqrtx/readme.md

@@ -6,7 +6,7 @@ Given a non-negative integer `x`, compute and return _the square root of_ `x`.
 
 Since the return type is an integer, the decimal digits are **truncated**, and only **the integer part** of the result is returned.
 
-**Note: **You are not allowed to use any built-in exponent function or operator, such as `pow(x, 0.5)` or `x ** 0.5`.
+**Note:** You are not allowed to use any built-in exponent function or operator, such as `pow(x, 0.5)` or `x ** 0.5`.
 
 **Example 1:**