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-keyboard-state.5.scd

@@ -65,13 +65,13 @@ The following *format-icons* can be set.
 
 ```
 "keyboard-state": {
-    "numlock": true,
-    "capslock": true,
-    "format": "{name} {icon}",
-    "format-icons": {
-        "locked": "",
-        "unlocked": ""
-    }
+	"numlock": true,
+	"capslock": true,
+	"format": "{name} {icon}",
+	"format-icons": {
+		"locked": "",
+		"unlocked": ""
+	}
 }
 ```