message: Add missing square bracket delimiters
diff: @@ -87,16 +87,24 @@ The _lexical structure_ of the Pikelet programming langues is a description of w
  > **Grammar**:
  >
  -> <a href="#var:punctuation"><var id="var:punctuation">punctuation</var></a> ::=\
  +> <a href="#var:delimiter"><var id="var:delimiter">delimiter</var></a> ::=\
  > &emsp;|&ensp;`{`\
  > &emsp;|&ensp;`}`\
  +> &emsp;|&ensp;`[`\
  +> &emsp;|&ensp;`]`\
  > &emsp;|&ensp;`(`\
  -> &emsp;|&ensp;`)`\
  +> &emsp;|&ensp;`)`
  +>
  +> <a href="#var:symbol"><var id="var:symbol">symbol</var></a> ::=\
  > &emsp;|&ensp;`:`\
  > &emsp;|&ensp;`,`\
  > &emsp;|&ensp;`=`\
  > &emsp;|&ensp;`->`\
  > &emsp;|&ensp;`;`
  +>
  +> <a href="#var:punctuation"><var id="var:punctuation">punctuation</var></a> ::=\
  +> &emsp;|&ensp;<a href="#var:delimiter"><var>delimiter</var></a>\
  +> &emsp;|&ensp;<a href="#var:symbol"><var>symbol</var></a>
  ### Numeric literals
  