Replace hyphen as dash with "Em Dash" unicode character (U+2014)

This commit replaces hyphen characters used as dash with the actual unicode character for dash. It avoids using HTML character entity reference (—), because IMHO it would make it a bit harder to read documents as plain markdown files on your local text editor.

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

docs/configuring-playbook-riot-web.md

@@ -21,9 +21,9 @@ We used to set up Riot at the `riot.example.com` domain. The playbook now sets u
 
 There are a few options for handling this:
 
-- (**avoiding changes** - using the old `riot.example.com` domain and avoiding DNS changes) -- to keep using `riot.example.com` instead of `element.example.com`, override the domain at which the playbook serves Element Web: `matrix_server_fqn_element: "riot.{{ matrix_domain }}"`
+- (**avoiding changes** — using the old `riot.example.com` domain and avoiding DNS changes) -- to keep using `riot.example.com` instead of `element.example.com`, override the domain at which the playbook serves Element Web: `matrix_server_fqn_element: "riot.{{ matrix_domain }}"`
 
-- (**embracing changes** - using only `element.example.com`) - set up the `element.example.com` DNS record (see [Configuring DNS](configuring-dns.md)). You can drop the `riot.example.com` in this case.
+- (**embracing changes** — using only `element.example.com`) — set up the `element.example.com` DNS record (see [Configuring DNS](configuring-dns.md)). You can drop the `riot.example.com` in this case.
 
 ### Re-running the playbook