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, 3 insertions, 3 deletions

diff --git a/documentation/sdk-manual/working-projects.rst b/documentation/sdk-manual/working-projects.rst
index efef5c8bd2..7f8d9b8491 100644
--- a/documentation/sdk-manual/working-projects.rst
+++ b/documentation/sdk-manual/working-projects.rst
@@ -174,19 +174,19 @@ variables and Makefile variables during development.
 The main point of this section is to explain the following three cases
 regarding variable behavior:
 
--  *Case 1 - No Variables Set in the Makefile Map to Equivalent
+-  *Case 1 --- No Variables Set in the Makefile Map to Equivalent
    Environment Variables Set in the SDK Setup Script:* Because matching
    variables are not specifically set in the ``Makefile``, the variables
    retain their values based on the environment setup script.
 
--  *Case 2 - Variables Are Set in the Makefile that Map to Equivalent
+-  *Case 2 --- Variables Are Set in the Makefile that Map to Equivalent
    Environment Variables from the SDK Setup Script:* Specifically
    setting matching variables in the ``Makefile`` during the build
    results in the environment settings of the variables being
    overwritten. In this case, the variables you set in the ``Makefile``
    are used.
 
--  *Case 3 - Variables Are Set Using the Command Line that Map to
+-  *Case 3 --- Variables Are Set Using the Command Line that Map to
    Equivalent Environment Variables from the SDK Setup Script:*
    Executing the ``Makefile`` from the command line results in the
    environment variables being overwritten. In this case, the