Document matches & for chunking

manual/src/control/01-conditionals.md

manual/src/control/02-loops.md

manual/src/control/03-matches.md

manual/src/expansions/01-variable.md

manual/src/expansions/02-process.md

manual/src/expansions/03-brace.md

manual/src/expansions/05-method.md

manual/src/functions.md

manual/src/history.md

manual/src/misc/01-implicitcd.md

manual/src/misc/04-multiargs.md

manual/src/misc/05-multicomments.md

manual/src/slicing.md

manual/src/variables/00-variables.md

manual/src/variables/04-arithmetic.md

manual/src/variables/05-exporting.md

manual/src/variables/06-scopes.md