Typo/style fixes in docs and code comments

Codespell(1)-pointed typos in files listed by `git ls-files`
(sans checkpatch.pl and possibly some others). Removed some
extra spaces. Added a few missing trailing periods.
`Default is ...`.  Added spaces in ' />' where missing
(sans e.g. wayland protocol and t/* files).
Fit some lines in docs/*.scd to 80 colums.

Used git grep commands (to find similar cases):
$ git grep -n '\S/>'
$ git grep -nF '.  '
$ git grep -n '[^\t*'\'',{#]\t'
$ git grep -ni 'default '

No functional change. No change in *.[ch] line numbers.

src/action.c

@@ -145,7 +145,7 @@ struct action_arg_list {
  * Will expand to:
  *
  * enum action_type {
- *	ACTION_TYPE_INVALID,
+ *	ACTION_TYPE_INVALID = 0,
  *	ACTION_TYPE_NONE,
  *	ACTION_TYPE_CLOSE,
  *	ACTION_TYPE_KILL,
@@ -1312,7 +1312,7 @@ run_action(struct view *view, struct action *action,
 
 			/*
 			 * To support only setting one of width/height
-			 * in <action name="ResizeTo" width="" height=""/>
+			 * in <action name="ResizeTo" width="" height="" />
 			 * we fall back to current dimension when unset.
 			 */
 			struct wlr_box box = {

src/config/rcxml.c

@@ -613,9 +613,9 @@ fill_mousebind(xmlNode *node, const char *context)
 	/*
 	 * Example of what we are parsing:
 	 * <mousebind button="Left" action="DoubleClick">
-	 *   <action name="Focus"/>
-	 *   <action name="Raise"/>
-	 *   <action name="ToggleMaximize"/>
+	 *   <action name="Focus" />
+	 *   <action name="Raise" />
+	 *   <action name="ToggleMaximize" />
 	 * </mousebind>
 	 */
 

src/img/img-xbm.c

@@ -226,7 +226,7 @@ out:
 
 /*
  * Openbox built-in icons are not bigger than 8x8, so have only written this
- * function to cope wit that max size
+ * function to cope with that max size
  */
 #define LABWC_BUILTIN_ICON_MAX_SIZE (8)
 

src/menu/menu.c

@@ -172,7 +172,7 @@ item_parse_accelerator(struct menuitem *item, const char *text)
 			accel_ptr = underscore + 1;
 			break;
 		} else {
-			/* Ignore empty accelertor */
+			/* Ignore empty accelerator */
 			break;
 		}
 	}
@@ -627,7 +627,7 @@ fill_menu(struct menu *parent, xmlNode *n)
 			 *
 			 * <?xml version="1.0" encoding="UTF-8"?>
 			 * <openbox_menu>
-			 *   <menu id="root-menu" label="foo" execute="bar"/>
+			 *   <menu id="root-menu" label="foo" execute="bar" />
 			 * </openbox_menu>
 			 */
 		} else {

src/theme.c

@@ -788,7 +788,7 @@ entry(struct theme *theme, const char *key, const char *value)
 			value, "window.button.spacing");
 	}
 
-	/* botton hover overlay */
+	/* button hover overlay */
 	if (match_glob(key, "window.button.hover.bg.color")) {
 		parse_color(value, theme->window_button_hover_bg_color);
 	}

src/window-rules.c

@@ -69,8 +69,8 @@ window_rules_get_property(struct view *view, const char *property)
 	 * for foot's "serverDecoration" property to be "default".
 	 *
 	 *     <windowRules>
-	 *       <windowRule identifier="*" serverDecoration="no"/>
-	 *       <windowRule identifier="foot" serverDecoration="default"/>
+	 *       <windowRule identifier="*" serverDecoration="no" />
+	 *       <windowRule identifier="foot" serverDecoration="default" />
 	 *     </windowRules>
 	 */
 	struct window_rule *rule;