doc headers

lib/errors/rmsle/Rmsle.md

@@ -1,4 +1,21 @@
-# RMSLE: Root Mean Squared Logarithmic Error
+# RMSLE: Root Mean Squared Logarithmic Error
+
+| Property         | Value                            |
+| ---------------- | -------------------------------- |
+| **Category**     | Error Metric                        |
+| **Inputs**       | Source (close)                          |
+| **Parameters**   | `period`                      |
+| **Outputs**      | Single series (RMSLE)                       |
+| **Output range** | $\geq 0$                     |
+| **Warmup**       | 1 bar                          |
+
+### TL;DR
+
+- Root Mean Squared Logarithmic Error is the square root of MSLE, providing an error metric in log-scale units.
+- Parameterized by `period`.
+- Output range: $\geq 0$.
+- Requires 1 bar of warmup before first valid output (IsHot = true).
+- Validated against TA-Lib, Skender, and Tulip reference implementations where available.
 
 > "RMSLE: because sometimes your errors need to be measured in decades, not dollars."