docs: drop discarded-value remarks

Remove the mention that a discarded value cannot be serialized to CBOR
(type_error.321) from the exception-safety and mapping sections. The
integer table and all added prose already follow the table-format and
Oxford-comma rules.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

docs/mkdocs/docs/api/basic_json/to_cbor.md

@@ -43,8 +43,7 @@ The exact mapping and its limitations are described on a [dedicated page](../../
 ## Exception safety
 
 Strong guarantee: if an exception is thrown, there are no changes in the JSON value. Bytes that were already written to
-the output adapter are not taken back; for `[1,2,<discarded>]`, three bytes are written before
-[`type_error.321`](../../home/exceptions.md#jsonexceptiontype_error321) is thrown.
+the output adapter are not taken back.
 
 ## Exceptions
 

docs/mkdocs/docs/features/binary_formats/cbor.md

@@ -95,11 +95,9 @@ see "binary" cells in the table above.
 
 !!! success "Complete mapping"
 
-    The mapping is **complete** in the sense that any JSON value type can be converted to a CBOR value, with two
-    exceptions: a [`discarded`](../../api/basic_json/is_discarded.md) value cannot be serialized and throws
-    [`type_error.321`](../../home/exceptions.md#jsonexceptiontype_error321), and an integer outside the range of CBOR
-    integers (only possible with a number type wider than 64 bits) throws
-    [`out_of_range.407`](../../home/exceptions.md#jsonexceptionout_of_range407).
+    The mapping is **complete** in the sense that any JSON value type can be converted to a CBOR value, with one
+    exception: an integer outside the range of CBOR integers (only possible with a number type wider than 64 bits)
+    throws [`out_of_range.407`](../../home/exceptions.md#jsonexceptionout_of_range407).
 
 !!! info "Not a deterministic encoding"