Clarify documentation for AINFO_SENSOR_PLACEMENT

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    AINFO_VEC3_CALIBRATION,

    /**

     * Location and orientation of sensor element in the device frame: origin is

     * the geometric center of the mobile device screen surface; the axis

     * definition corresponds to Android sensor definitions.

     * float[12]: 3x4 matrix in row major order

     * Provides the orientation and location of the sensor element in terms of

     * the Android coordinate system. This data is given as a 3x4 matrix

     * consisting of a 3x3 rotation matrix (R) concatenated with a 3x1 location

     * vector (t). The rotation matrix provides the orientation of the Android

     * device coordinate frame relative to the local coordinate frame of the

     * sensor. Note that assuming the axes conventions of the sensor are the

     * same as Android, this is the inverse of the matrix applied to raw

     * samples read from the sensor to convert them into the Android

     * representation. The location vector represents the translation from the

     * origin of the Android sensor coordinate system to the geometric center

     * of the sensor, specified in millimeters (mm).

     *

     * float[12]: 3x4 matrix in row major order [R; t]

     *

     * Example:

     *     This raw buffer: {0, 1, 0, 0, -1, 0, 0, 10, 0, 0, 1, -2.5}

     *     Corresponds to this 3x4 matrix:

     *         0 1 0    0

     *        -1 0 0   10

     *         0 0 1 -2.5

     *     The sensor is oriented such that:

     *         - the device X axis corresponds to the sensor's local -Y axis

     *         - the device Y axis corresponds to the sensor's local X axis

     *         - the device Z axis and sensor's local Z axis are equivalent

     *     In other words, if viewing the origin of the Android coordinate

     *     system from the positive Z direction, the device coordinate frame is

     *     to be rotated 90 degrees counter-clockwise about the Z axis to align

     *     with the sensor's local coordinate frame. Equivalently, a vector in

     *     the Android coordinate frame may be multiplied with R to rotate it

     *     90 degrees clockwise (270 degrees counter-clockwise), yielding its

     *     representation in the sensor's coordinate frame.

     *     Relative to the origin of the Android coordinate system, the physical

     *     center of the sensor is located 10mm in the positive Y direction, and

     *     2.5mm in the negative Z direction.

     */

    AINFO_SENSOR_PLACEMENT,