Markdown indented code blocks (#20473)

* Implement Markdown indented code blocks

Additional indentation of 4 spaces makes a block an "indented code block"
(monospaced text without syntax highlighting).
Also `::` RST syntax for code blocks is disabled.

So instead of
```rst
see::

  Some code
```

the code block should be written as
```markdown
see:

    Some code
```

* Migrate RST literal blocks :: to Markdown's ones
This commit is contained in:
Andrey Makarov 2022-10-05 21:03:10 +03:00 • committed by GitHub
commit 6505bd347d
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33 changed files with 697 additions and 603 deletions

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@ -171,9 +171,9 @@ For strings and numeric types the optional argument is a so-called
# Standard format specifiers for strings, integers and floats
The general form of a standard format specifier is::
The general form of a standard format specifier is:
[[fill]align][sign][#][0][minimumwidth][.precision][type]
[[fill]align][sign][#][0][minimumwidth][.precision][type]
The square brackets `[]` indicate an optional element.
@ -423,9 +423,9 @@ proc formatInt(n: SomeNumber; radix: int; spec: StandardFormatSpecifier): string
proc parseStandardFormatSpecifier*(s: string; start = 0;
ignoreUnknownSuffix = false): StandardFormatSpecifier =
## An exported helper proc that parses the "standard format specifiers",
## as specified by the grammar::
## as specified by the grammar:
##
## [[fill]align][sign][#][0][minimumwidth][.precision][type]
## [[fill]align][sign][#][0][minimumwidth][.precision][type]
##
## This is only of interest if you want to write a custom `format` proc that
## should support the standard format specifiers. If `ignoreUnknownSuffix` is true,