variables: Clarify that list filter doesn't do any escaping

Author: sirainen

docs/core/settings/variables.md

@@ -117,7 +117,7 @@ Bytes output type indicates that the output will be tagged as binary output. Sub
 | `ldap_dn` | String | String | Converts `domain.com` to `dc=domain,dc=com`. |
 | `lenumber` | Bytes | Number | Convert little-endian encoded input into a number. |
 | `lfill(width, filler)` | Any | Any | Pads value from left with filler until length is width. Default filler is `0`. |
-| `list(separator)` | String | String | Converts tab-escaped list into separator separated list. Defaults to `,`. |
+| `list(separator)` | String | String | Converts tab-escaped list into separator separated list. There is no escaping if the value already contains the separator. Defaults to `,`. |
 | `literal(string)` | None | String | Expands into literally the value. If variable is used, works like lookup. Input is ignored. |
 | `lookup(name)` | None | String | Lookup var from table. If var is variable, the name is taken from variable's contents. Input is ignored. |
 | `lower` | String | String | Lowercases input. |