refactor(algorithms, intervals, count days): update constraints in doc

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Author: BrianLusina

algorithms/intervals/count_days/README.md

@@ -12,7 +12,7 @@ Your task is to count the days when the employee is available for work but has n
 
 - 1 <= days <= 10^5
 - 1 <= meetings.length <= 10^3
-- meetings.length == 2
+- meetings[i].length == 2
 - 1 <= `meetings[i][0]` <= `meetings[i][1]` <= days
 
 ## Examples