man: Fix several whitespace formatting issues

Fix the following whitespace formatting issues:
- Indentation in scdoc source files should be done with tabs.
- Lines where there (clearly) should be a line break, need to have '++'
  at the end, but several were missing them.
- The scdoc manual (clearly) states that lines should be hard wrapped
  at 80 columns, but when line(s) are indented, that causes rendering
  issues. So lines where a line break was not clearly intended or
  clearly not intended, have been put onto 1 line to circumvent the
  rendering issue.

Link: https://lists.sr.ht/~sircmpwn/public-inbox/%3C8251560.T7Z3S40VBb%40bagend%3E

man/waybar-wireplumber.5.scd

@@ -93,9 +93,9 @@ The *wireplumber* module displays the current volume reported by WirePlumber.
 
 ```
 "wireplumber": {
-    "format": "{volume}%",
-    "format-muted": "",
-    "on-click": "helvum"
+	"format": "{volume}%",
+	"format-muted": "",
+	"on-click": "helvum"
 }
 ```