spelling: than

Signed-off-by: Josh Soref <2119212+jsoref@users.noreply.github.com>

src/fw/applib/health_service.h

@@ -490,7 +490,7 @@ typedef struct {
 //!      exit, the UTC time of the end of the last record actually returned (i.e. start time of last
 //!      record + 60). If `time_end` on entry is somewhere in the middle of a minute interval, this
 //!      function behaves as if the caller passed in the end of that minute.
-//! @return Actual number of records returned. May be less then the maximum requested.
+//! @return Actual number of records returned. May be less than the maximum requested.
 //! @note If the return value is zero, `time_start` and `time_end` are meaningless.
 //!      It's not guaranteed that all records contain valid data, even if the return value is
 //!      greater than zero. Check `HealthMinuteData.is_invalid` to see if a given record contains

src/fw/services/normal/activity/activity_calculators.c

@@ -105,7 +105,7 @@ uint32_t activity_private_compute_distance_mm(uint32_t steps, uint32_t ms) {
 //   active_ml = 0.2 * speed_m_per_min * minutes * weight_kg
 //
 // Converting to calories (5.01 calories per ml) and plugging in distance for speed * time, we get
-// the following. We will define walking as less then 4.5MPH (120 meters/minute)
+// the following. We will define walking as less than 4.5MPH (120 meters/minute)
 // for walking:
 //   active_cal = 0.1 * distance_m * weight_kg * 5.01
 //              = 0.501 * distance_m * weight_kg