docs: double-encoding for manifestJsonEx examples

[adam-azarchs]

The stdlib documentation for manifestJson, manifestJsonMinified, and manifestJsonEx use the same formatting logic as other functions with examples,

jsonnet/doc/_stdlib_gen/stdlib.jsonnet

Line 16 in 5a4e8e3

html.spaceless([html.code({}, ex.input), ' yields ', html.code({}, manifestJsonSingleLine(ex.output))])

which passes the result through

jsonnet/doc/_stdlib_gen/stdlib.jsonnet

Line 9 in 5a4e8e3

local manifestJsonSingleLine(val) = std.strReplace(std.manifestJsonEx(val, ''), '\n', ' ');

Specifically for these functions, this seriously obfuscates the results, e.g.

jsonnet/doc/_stdlib_gen/stdlib-content.jsonnet

Lines 774 to 799 in 5a4e8e3

	examples: [
	{
	input: |||
	std.manifestJsonEx(
	{
	x: [1, 2, 3, true, false, null,
	"string\nstring"],
	y: { a: 1, b: 2, c: [1, 2] },
	}, " ")
	|||,
	output:
	std.manifestJsonEx(
	{
	x: [
	1,
	2,
	3,
	true,
	false,
	null,
	'string\nstring',
	],
	y: { a: 1, b: 2, c: [1, 2] },
	}, ' '
	),
	},

renders as

Example: std.manifestJsonEx( { x: [1, 2, 3, true, false, null, "string\nstring"], y: { a: 1, b: 2, c: [1, 2] }, }, " ") yields "{\n \"x\": [\n 1,\n 2,\n 3,\n true,\n false,\n null,\n \"string\\nstring\"\n ],\n \"y\": {\n \"a\": 1,\n \"b\": 2,\n \"c\": [\n 1,\n 2\n ]\n }\n}".

It should really not be stripping the repeaded whitespaces from the example input, and it should be rendering the output as

{
    "x": [
        1,
        2,
        3,
        true,
        false,
        null,
        "string\nstring"
    ],
    "y": {
        "a": 1,
        "b": 2,
        "c": [
            1,
            2
        ]
    }
}

more similarly to the documentation for the other manifest* functions, e.g.

jsonnet/doc/_stdlib_gen/stdlib-content.jsonnet

Lines 900 to 929 in 5a4e8e3

	html.pre({}, |||
	std.manifestYamlDoc(
	{
	x: [1, 2, 3, true, false, null,
	"string\nstring\n"],
	y: { a: 1, b: 2, c: [1, 2] },
	},
	indent_array_in_object=false)
	|||),
	html.p({}, |||
	Yields a string containing this YAML:
	|||),
	html.pre({}, |||
	"x":
	- 1
	- 2
	- 3
	- true
	- false
	- null
	- |
	string
	string
	"y":
	"a": 1
	"b": 2
	"c":
	- 1
	- 2
	|||),