Global: Fix typos

AntennaTracker/GCS_Mavlink.cpp

@@ -523,7 +523,7 @@ void GCS_MAVLINK_Tracker::handleMessage(mavlink_message_t* msg)
     switch (msg->msgid) {
 
     // If we are currently operating as a proxy for a remote, 
-    // alas we have to look inside each packet to see if its for us or for the remote
+    // alas we have to look inside each packet to see if it's for us or for the remote
     case MAVLINK_MSG_ID_REQUEST_DATA_STREAM:
     {
         handle_request_data_stream(msg, false);

Tools/APM2_2560_bootloader/stk500boot.c

@@ -461,7 +461,7 @@ uint32_t count = 0;
 		#else
 			data	=	pgm_read_word_near(0);	//*	get the first word of the user program
 		#endif
-			if (data != 0xffff)					//*	make sure its valid before jumping to it.
+			if (data != 0xffff)					//*	make sure it's valid before jumping to it.
 			{
 				asm volatile(
 						"clr	r30		\n\t"

Tools/CHDK-Scripts/Cannon S100/3DR_EAI_S100.lua

@@ -584,7 +584,7 @@ else
             -- intervalometer timing
             next_shot_time = next_shot_time + interval
 
-            -- set focus at infinity ? (maybe redundant for AFL & MF mode but makes sure its set right)
+            -- set focus at infinity ? (maybe redundant for AFL & MF mode but makes sure it's set right)
             if (focus_mode > 0) then
                 set_focus(infx)
                 sleep(100)

Tools/CHDK-Scripts/Cannon SX260/3DR_EAI_SX260.lua

@@ -583,7 +583,7 @@ else
             -- intervalometer timing
             next_shot_time = next_shot_time + interval
 
-            -- set focus at infinity ? (maybe redundant for AFL & MF mode but makes sure its set right)
+            -- set focus at infinity ? (maybe redundant for AFL & MF mode but makes sure it's set right)
             if (focus_mode > 0) then
                 set_focus(infx)
                 sleep(100)

Tools/CHDK-Scripts/kap_uav.lua

@@ -555,7 +555,7 @@ else
             -- intervalometer timing
             next_shot_time = next_shot_time + interval
 
-            -- set focus at infinity ? (maybe redundant for AFL & MF mode but makes sure its set right)
+            -- set focus at infinity ? (maybe redundant for AFL & MF mode but makes sure it's set right)
             if (focus_mode > 0) then
                 set_focus(infx)
                 sleep(100)

libraries/AP_Arming/AP_Arming.cpp

@@ -239,7 +239,7 @@ bool AP_Arming::ins_checks(bool report)
                 // get next gyro vector
                 const Vector3f &gyro_vec = ins.get_gyro(i);
                 Vector3f vec_diff = gyro_vec - prime_gyro_vec;
-                // allow for up to 5 degrees/s difference. Pass if its
+                // allow for up to 5 degrees/s difference. Pass if it has
                 // been OK in last 10 seconds
                 if (vec_diff.length() <= radians(5)) {
                     last_gyro_pass_ms[i] = AP_HAL::millis();

libraries/AP_GPS/AP_GPS.cpp

@@ -319,7 +319,7 @@ AP_GPS::detect_instance(uint8_t instance)
             new_gps = new AP_GPS_ERB(*this, state[instance], _port[instance]);
         }
         // user has to explicitly set the MAV type, do not use AUTO
-        // Do not try to detect the MAV type, assume its there
+        // Do not try to detect the MAV type, assume it's there
         else if (_type[instance] == GPS_TYPE_MAV) {
             _broadcast_gps_type("MAV", instance, dstate->last_baud);
             new_gps = new AP_GPS_MAV(*this, state[instance], NULL);

libraries/AP_HAL/AP_HAL_Boards.h

@@ -2,7 +2,7 @@
  * C preprocesor enumeration of the boards supported by the AP_HAL.
  * This list exists so HAL_BOARD == HAL_BOARD_xxx preprocessor blocks
  * can be used to exclude HAL boards from the build when appropriate.
- * Its not an elegant solution but we can improve it in future.
+ * It's not an elegant solution but we can improve it in future.
  */
 #pragma once
 

libraries/AP_HAL/RCInput.h

@@ -10,7 +10,7 @@ public:
     /**
      * Call init from the platform hal instance init, so that both the type of
      * the RCInput implementation and init argument (e.g. ISRRegistry) are
-     * known to the programmer. (Its too difficult to describe this dependency
+     * known to the programmer. (It's too difficult to describe this dependency
      * in the C++ type system.)
      */
     virtual void init() = 0;

libraries/AP_Terrain/TerrainGCS.cpp

@@ -45,7 +45,7 @@ bool AP_Terrain::request_missing(mavlink_channel_t chan, struct grid_cache &gcac
 
     // see if we are waiting for disk read
     if (gcache.state == GRID_CACHE_DISKWAIT) {
-        // don't request data from the GCS till we know its not on disk
+        // don't request data from the GCS till we know it's not on disk
         return false;
     }
 

libraries/GCS_MAVLink/GCS_Common.cpp

@@ -936,7 +936,7 @@ void GCS_MAVLINK::send_message(enum ap_message id)
     // this message id might already be deferred
     for (i=0, nextid = next_deferred_message; i < num_deferred_messages; i++) {
         if (deferred_messages[nextid] == id) {
-            // its already deferred, discard
+            // it's already deferred, discard
             return;
         }
         nextid++;