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-image.5.scd

@@ -13,24 +13,26 @@ The *image* module displays an image from a path.
 *path*: ++
 	typeof: string ++
 	The path to the image.
+
 *exec*: ++
 	typeof: string ++
-	The path to the script, which should return image path file
-	it will only execute if the path is not set
+	The path to the script, which should return image path file. ++
+	It will only execute if the path is not set
+
 *size*: ++
 	typeof: integer ++
 	The width/height to render the image.
 
 *interval*: ++
 	typeof: integer ++
-	The interval (in seconds) to re-render the image.
-	This is useful if the contents of *path* changes.
+	The interval (in seconds) to re-render the image. ++
+	This is useful if the contents of *path* changes. ++
 	If no *interval* is defined, the image will only be rendered once.
 
 *signal*: ++
 	typeof: integer ++
-	The signal number used to update the module.
-	This can be used instead of *interval* if the file changes irregularly.
+	The signal number used to update the module. ++
+	This can be used instead of *interval* if the file changes irregularly. ++
 	The number is valid between 1 and N, where *SIGRTMIN+N* = *SIGRTMAX*.
 
 *on-click*: ++