max date on UI as per max validity configs

docs/administration.rst

@@ -172,6 +172,17 @@ Specifying the `SQLALCHEMY_MAX_OVERFLOW` to 0 will enforce limit to not create c
         PUBLIC_CA_MAX_VALIDITY_DAYS = 365
 
 
+.. data:: INTERNAL_CA_MAX_VALIDITY_DAYS
+    :noindex:
+        Use this config to override the limit of 365 days of validity for certificates issued by internal CA. Any CA which is
+        not listed in PUBLIC_CA_AUTHORITY_NAMES will be treated as internal. Below example overrides the default validity of
+        365 days and sets it to 90 days.
+
+    ::
+
+        INTERNAL_CA_MAX_VALIDITY_DAYS = 90
+
+
 .. data:: DEBUG_DUMP
     :noindex: