Update code-description.md

Author: hubwriter

code-description.md

@@ -312,6 +312,7 @@ The following variables and constants are used in the script. Except where marke
 - **highlightBackgroundColor**: (constant) an array of strings. Each nesting level, including none, has a different background color. For instance: `highlightBackgroundColor[0]`, for tags in an un-nested tag set, might be "red".
 - **highlightForegroundColor**: (constant) an array of strings. The color of the text in the highlighted tags at each nesting level. Generally, where the background colors are all strong/dark colors, all elements of `highlightForegroundColor` will be set to "white".
 - **match[]**: an array of strings. This is used to store the text matched by the regular expression that we use to find version tags in the Markdown file.
+- **message**: a string. This short-lived variable is just used to assemble the final message text that we'll display to the user.
 - **nestingLevel**: a number. This records the nesting level of versioning at the cursor position. When we start parsing the Markdown file, this is set to -1. Each time we find an `ifversion` tag, during parsing, we increment this value. So at the first `ifversion` tag, `nestingLevel` gets incremented to 0. A nesting level of 0 means there's versioning, but we're in a base level tag set with no nesting. Each time we find an `endif` tag we decrement this value. So, if we reach the end of an un-nested tag set without encountering another `ifversion` tag then we decrement `nestingLevel` back to -1 (no versioning).
 - **positionString**: a string containing " at the cursor position (line _n_, character _n_) ". We use this in the message displayed to the user.
 - **ranges**: an array of vscode.Range objects. Each element of this array identifies the start and end a range of text (a tag) that we'll highlight in the VS Code editor.