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: 5918f019f63f6e820b1168f4cc001faa1d1cdc6f)

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

1 files changed, 1 insertions, 1 deletions

diff --git a/documentation/overview-manual/development-environment.rst b/documentation/overview-manual/development-environment.rst
index f1001e0bd3..43a6f1b480 100644
--- a/documentation/overview-manual/development-environment.rst
+++ b/documentation/overview-manual/development-environment.rst
@@ -52,7 +52,7 @@ A development host or :term:`Build Host` is key to
 using the Yocto Project. Because the goal of the Yocto Project is to
 develop images or applications that run on embedded hardware,
 development of those images and applications generally takes place on a
-system not intended to run the software - the development host.
+system not intended to run the software --- the development host.
 
 You need to set up a development host in order to use it with the Yocto
 Project. Most find that it is best to have a native Linux machine