Rewrite comments of child tag functions

Simpler is better. The function names are already descriptive.

tags/terminal.tag

@@ -145,14 +145,9 @@
     }
   }
 
-  /**
-   * Empty the display.
-   *
-   * An extra update is needed for subsequent changes to `output` (e.g. `add()`,
-   * `restore()`) to display properly.
-   */
   clear() {
     this.output.length = 0
+    // This is needed for subsequent changes to `output` to display properly.
     this.update()
   }
 
@@ -168,17 +163,9 @@
     }
   }
 
-  /**
-   * Make sure whitespace displays correctly.
-   *
-   * Keep the following:
-   *
-   * - Newlines.
-   * - Whitespace for display. This means all spaces that are not within tags.
-   */
   preserveWhiteSpace(text) {
     text = text.replace(/(?:\r\n|\r|\n)/g, '<br />')
-    // Search for tags or whitespace. Replace whitespace, leave the tags.
+    // Search for tags or whitespace. Escape whitespace, leave tags.
     text = text.replace(/<[^<]+>|( )/g, function(match, group1) {
       if (group1 == " ") { return '&nbsp;' }
       return match
@@ -236,7 +223,7 @@
 <raw>
   <span></span>
 
-  // Initialise contents from tag options, but expose `write()` for updating.
+  // Initialise HTML from tag options and expose `write()` for updating.
   write(text) {
     this.root.innerHTML = text
   }