Add missing characters in documentation of `compile_multilib` property.

	// control whether this module compiles for 32-bit, 64-bit, or both.  Possible values

	// are "32" (compile for 32-bit only), "64" (compile for 64-bit only), "both" (compile for both

	// architectures), or "first" (compile for 64-bit on a 64-bit platform, and 32-bit on a 32-bit

	// platform

	// platform).

	Compile_multilib *string `android:"arch_variant"`

	Target struct {