docs(rate_limit): correct measured headroom in match timeout comment

      # MAX_REGEX_SOURCE_LENGTH bounds the pattern, not the match: short

      # patterns can still backtrack badly. This bounds the match.

      #

      # 5ms is ~10,000x the slowest realistic match measured against

      # GitLab-style route patterns (worst observed: 0.0005ms), so a

      # legitimate rule cannot trip it even on a loaded box, while a

      # Measured against GitLab's real RackAttack path patterns

      # (API_PATH_REGEX, WEB_PATH_REGEX, Packages::API_PATH_REGEX and the

      # health/internal/registry/collector patterns) on inputs up to 16KB,

      # including many-segment and newline-heavy paths: worst observed match

      # 0.0419ms, none timed out. 5ms is therefore ~119x the slowest real

      # match - enough that a legitimate rule will not trip it, while a

      # pathological one is capped well below a request budget.

      #

      # None of those patterns use nested quantifiers or backreferences, so

      # none can backtrack exponentially; re-measure if that changes.

      MATCH_TIMEOUT_SECONDS = 0.005

      def self.build(input)