RFC 43: Clarify single line per sentence specification

The markdown line length check is disabled to facilitate having a single
sentence per line, making diffs easier to review and avoiding text
rewrapping when changes occur in a hunk.

During implementation of this RFC we figured out that the initial
intention of disabling the line length was not written down explicitly.
Fix this by putting the intention and expectation into the specification
section of the RFC.

Signed-off-by: Levente Polyak <anthraxx@archlinux.org>

rfcs/0043-streamline-the-rfc-writing-process.rst

@@ -44,6 +44,7 @@ Specification
 In an initial step, we will convert the current RST-based `RFC template`_ to markdown and adapt integration accordingly.
 
 In a second iteration we will add a configurable spellchecker (`typos`_), a code linter (`markdownlint`_) and a prose linter (`vale`_), which will be integrated with the central build system and CI of the project.
+The markdown line length check is disabled to facilitate having a single sentence per line, making diffs easier to review and avoiding text rewrapping when changes occur in a hunk.
 
 The following configuration items should be disabled for `markdownlint`_: