bitbake: bitbake: bitbake-user-manual: punctuation fixes

- Replace hyphens by em dashes when necessary
  See https://www.grammarly.com/blog/hyphens-and-dashes/
- No uppercase after em dashes
- No uppercase after colons if what follows is not a
  complete sentence.
- Fix spacing before colons ":"
- Replace em-dashes with colons for consistency in a section

(Bitbake rev: 72230d6a9976b3bfca1f1e6fb09736fec195e2fe)

(Bitbake rev: f1c4ac816e927f490fb9852c12aa408e8c9403b1)

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

1 files changed, 2 insertions, 2 deletions

diff --git a/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.rst b/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.rst
index ea42d77ca1..af4b135867 100644
--- a/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.rst
+++ b/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.rst
@@ -1658,8 +1658,8 @@ user interfaces:
 
 .. _variants-class-extension-mechanism:
 
-Variants - Class Extension Mechanism
-====================================
+Variants --- Class Extension Mechanism
+======================================
 
 BitBake supports multiple incarnations of a recipe file via the
 :term:`BBCLASSEXTEND` variable.