Specify authority for Chinese and Dangi calendars

Author: sffc

spec.emu

@@ -58,15 +58,15 @@ contributors: Google, Ecma International
           </tr>
           <tr>
             <td>*"chinese"*</td>
-            <td>Traditional Chinese calendar, proleptic. Similar lunisolar algorithm to *"dangi"*. The arithmetic year is identical to *"gregory"* and there are no eras.</td>
+            <td>Traditional Chinese calendar, proleptic. Lunisolar calendar using months based on GB/T 33661-2017 between 1900 and 2100, falling back to an implementation-defined approximation outside that range. The arithmetic year is identical to *"gregory"*, and there are no eras.</td>
           </tr>
           <tr>
             <td>*"coptic"*</td>
             <td>Coptic calendar, proleptic. Similar solar algorithm to *"ethioaa"* and *"ethiopic"*, with one era and a different epoch year.</td>
           </tr>
           <tr>
             <td>*"dangi"*</td>
-            <td>Traditional Korean calendar, proleptic. Similar lunisolar algorithm to *"chinese"*. The arithmetic year is identical to *"gregory"* and there are no eras.</td>
+            <td>Traditional Korean calendar, proleptic. Lunisolar calendar using months published by the Korea Astronomy and Space Science Institute (KASI) between 1900 and 2050, falling back to an implementation-defined approximation outside that range. The arithmetic year is identical to *"gregory"*, and there are no eras.</td>
           </tr>
           <tr>
             <td>*"ethioaa"*</td>
@@ -102,7 +102,7 @@ contributors: Google, Ecma International
           </tr>
           <tr>
             <td>*"islamic-umalqura"*</td>
-            <td>Hijri calendar, proleptic, Umm al-Qura. Lunisolar calendar using KACST-calculated months from the start of 1300 AH to the end of 1600 AH and falls back to *"islamic-civil"* outside that range.</td>
+            <td>Hijri calendar, proleptic, Umm al-Qura. Lunar calendar using KACST-calculated months from the start of 1300 AH to the end of 1600 AH, falling back to *"islamic-civil"* outside that range.</td>
           </tr>
           <tr>
             <td>*"islamicc"*</td>