doc: ensure brief for bit_manip name space is the same across files

Author: realstealthninja

bit_manipulation/count_distinct_primes_from_binary_string.cpp

@@ -28,7 +28,7 @@ static std::vector<bool> is_prime;
 
 /**
  * @namespace bit_manipulation
- * @brief Bit manipulation algorithms and prime preprocessing
+ * @brief Bit manipulation algorithms
  */
 namespace bit_manipulation {