manuals: replace hyphens with em dashes

Fix some hyphens being improperly used as em dashes.
See https://www.grammarly.com/blog/hyphens-and-dashes/

Using em dashes may also allow Sphinx to hyphenate
and break lines in the best way.

Note that the first character after an em dash not
supposed to be capitalized, unless a specific
rule applies, typically when what follows is a proper noun.

Fix a few misuses of parentheses in following text.

(From yocto-docs rev: a0d93ea1ddfdfbcde8dac3aa328307be778f9e3c)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

1 files changed, 0 insertions, 1 deletions

diff --git a/documentation/migration-guides/migration-3.3.rst b/documentation/migration-guides/migration-3.3.rst
index b1b81d6839..775ee3172b 100644
--- a/documentation/migration-guides/migration-3.3.rst
+++ b/documentation/migration-guides/migration-3.3.rst
@@ -17,7 +17,6 @@ using ``scripts/install-buildtools``) --- see
 :ref:`ref-manual/system-requirements:required git, tar, python, make and gcc versions`
 for details.
 
-
 .. _migration-3.3-removed-recipes:
 
 Removed recipes