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, 2 insertions, 2 deletions

diff --git a/documentation/test-manual/intro.rst b/documentation/test-manual/intro.rst
index 12324e592c..6421dd53c9 100644
--- a/documentation/test-manual/intro.rst
+++ b/documentation/test-manual/intro.rst
@@ -85,8 +85,8 @@ topology that includes a controller and a cluster of workers:
    :align: center
    :width: 70%
 
-Yocto Project Tests - Types of Testing Overview
-===============================================
+Yocto Project Tests --- Types of Testing Overview
+=================================================
 
 The Autobuilder tests different elements of the project by using
 the following types of tests: