📝 make examples collapsible

doc/mkdocs/docs/features/binary_formats/bson.md

@@ -36,7 +36,7 @@ binary          | *any value*                       | binary      | 0x05
     and the keys may not contain U+0000, since they are serialized a
     zero-terminated c-strings.
 
-!!! example
+??? example
 
     ```cpp
     --8<-- "examples/to_bson.cpp"
@@ -81,7 +81,7 @@ Min Key         | 0xFF             | *unsupported*
     The mapping is **incomplete**. The unsupported mappings are indicated in the table above.
 
 
-!!! example
+??? example
 
     ```cpp
     --8<-- "examples/from_bson.cpp"

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

@@ -84,7 +84,7 @@ binary          | *size*: 4294967296..18446744073709551615   | byte string (8 by
       - half-precision floats (0xF9)
       - break (0xFF)
 
-!!! example
+??? example
 
     ```cpp
     --8<-- "examples/to_cbor.cpp"
@@ -159,7 +159,7 @@ Double-Precision Float | number_float    | 0xFB
 
 	CBOR allows map keys of any type, whereas JSON only allows strings as keys in object values. Therefore, CBOR maps with keys other than UTF-8 strings are rejected.
 
-!!! example
+??? example
 
     ```cpp
     --8<-- "examples/from_cbor.cpp"

doc/mkdocs/docs/features/binary_formats/index.md

@@ -5,7 +5,7 @@ Though JSON is a ubiquitous data format, it is not a very compact format suitabl
 - [BSON](bson.md) (Binary JSON),
 - [CBOR](cbor.md) (Concise Binary Object Representation),
 - [MessagePack](messagepack.md), and
-- [UBJSON](ubjson.md) (Universal Binary JSON Specification)
+- [UBJSON](ubjson.md) (Universal Binary JSON)
 
 to efficiently encode JSON values to byte vectors and to decode such vectors.
 
@@ -29,6 +29,8 @@ to efficiently encode JSON values to byte vectors and to decode such vectors.
 | MessagePack | supported     | supported       |
 | UBJSON      | not supported | not supported   |
 
+See [binary values](../binary_values.md) for more information.
+
 ### Sizes
 
 | Format             | canada.json | twitter.json | citm_catalog.json | jeopardy.json |
@@ -39,3 +41,5 @@ to efficiently encode JSON values to byte vectors and to decode such vectors.
 | UBJSON             | 53,2 %      | 91,3 %       | 78,2 %            | 96,6 %        |
 | UBJSON (size)      | 58,6 %      | 92,3 %       | 86,8 %            | 97,4 %        |
 | UBJSON (size+type) | 55,9 %      | 92,3 %       | 85,0 %            | 95,0 %        |
+
+Sizes compared to minified JSON value.

doc/mkdocs/docs/features/binary_formats/messagepack.md

@@ -69,7 +69,7 @@ binary          | *size*: 65536..4294967295         | bin 32           | 0xC6
 
 	If NaN or Infinity are stored inside a JSON number, they are serialized properly. function which serializes NaN or Infinity to `null`.
 
-!!! example
+??? example
 
     ```cpp
     --8<-- "examples/to_msgpack.cpp"
@@ -129,7 +129,7 @@ negative fixint  | number_integer  | 0xE0-0xFF
 	Any MessagePack output created by `to_msgpack` can be successfully parsed by `from_msgpack`.
 
 
-!!! example
+??? example
 
     ```cpp
     --8<-- "examples/from_msgpack.cpp"

doc/mkdocs/docs/features/binary_formats/ubjson.md

@@ -81,7 +81,7 @@ object          | *see notes on optimized format*   | map         | `{`
     different JSON object.
 
 
-!!! example
+??? example
 
     ```cpp
     --8<-- "examples/to_ubjson.cpp"
@@ -120,7 +120,7 @@ object      | object (optimized values are supported) | `{`
 	The mapping is **complete** in the sense that any UBJSON value can be converted to a JSON value.
 
 
-!!! example
+??? example
 
     ```cpp
     --8<-- "examples/from_ubjson.cpp"