to-xml.md documentation update (#2253)

* Update to-xml.md documentation to be consistent

* Capitalize bullet point items

* Add link to this document wthin `to.md`

docs/commands/to-xml.md

@@ -4,7 +4,7 @@ Converts table data into XML text.
 
 ## Flags
 
--   `-p`, `--pretty` \<integer>: Formats the XML text with the provided indentation setting
+* `-p`, `--pretty` \<integer>: Formats the XML text with the provided indentation setting
 
 ## Example
 
@@ -70,7 +70,7 @@ Converts table data into XML text.
 
 Due to XML and internal representation, `to xml` is currently limited, it will:
 
--   only process table data loaded from XML files (e.g. `open file.json | to xml` will fail)
--   drop XML prolog declarations
--   drop namespaces
--   drop comments
+* Only process table data loaded from XML files (e.g. `open file.json | to xml` will fail)
+* Drop XML prolog declarations
+* Drop namespaces
+* Drop comments