android.mime.types: Fix typo.

#

# Android-specific MIME type <-> extension mappings

#

# Each line below defines an mapping from one MIME type to the first of the

# Each line below defines a mapping from one MIME type to the first of the

# listed extensions, and from listed extension back to the MIME type.

# A mapping overrides any previous mapping _from_ that same MIME type or

# extension (put() semantics), unless that MIME type / extension is prefixed with '?'