Fix Codespell complaints

Author: khoih-prog

README.md

@@ -449,7 +449,7 @@ Supposing the STM32 stm32 core version is 2.3.0. These files must be copied into
 - `~/.arduino15/packages/STM32/hardware/stm32/2.3.0/system/STM32F7xx/stm32f7xx_hal_conf_default.h` for Nucleo-144 STM32F7.
 
 Whenever a new version is installed, remember to copy this file into the new version directory. For example, new version is x.yy.zz,
-theses files must be copied into the corresponding directory:
+these files must be copied into the corresponding directory:
 
 - `~/.arduino15/packages/STM32/hardware/stm32/x.yy.zz/system/STM32F4xx/stm32f4xx_hal_conf_default.h`
 - `~/.arduino15/packages/STM32/hardware/stm32/x.yy.zz/system/STM32F7xx/stm32f7xx_hal_conf_default.h
@@ -465,7 +465,7 @@ Supposing the STM32 stm32 core version is 2.3.0. These files must be copied into
 - `~/.arduino15/packages/STM32/hardware/stm32/2.3.0/variants/STM32L0xx/L052R(6-8)T_L053R(6-8)T_L063R8T/NUCLEO_L053R8/variant.h` for Nucleo-64 NUCLEO_L053R8.
 
 Whenever a new version is installed, remember to copy this file into the new version directory. For example, new version is x.yy.zz,
-theses files must be copied into the corresponding directory:
+these files must be copied into the corresponding directory:
 
 - `~/.arduino15/packages/STM32/hardware/stm32/x.yy.zz/variants/STM32F7xx/F765Z(G-I)T_F767Z(G-I)T_F777ZIT/NUCLEO_F767ZI/variant.h`
 - `~/.arduino15/packages/STM32/hardware/stm32/x.yy.zz/variants/STM32L0xx/L052R(6-8)T_L053R(6-8)T_L063R8T/NUCLEO_L053R8/variant.h`
@@ -929,7 +929,7 @@ void check_status()
   static unsigned long checkstatus_timeout = 0;
 
 #define HEARTBEAT_INTERVAL    10000L
-  // Print hearbeat every HEARTBEAT_INTERVAL (10) seconds.
+  // Print heartbeat every HEARTBEAT_INTERVAL (10) seconds.
   if ((millis() > checkstatus_timeout) || (checkstatus_timeout == 0))
   {
     heartBeatPrint();
@@ -939,7 +939,7 @@ void check_status()
 
 void enterConfigPortal()
 {
-  //Local intialization. Once its business is done, there is no need to keep it around
+  //Local initialization. Once its business is done, there is no need to keep it around
   ESP_AT_WiFiManager ESP_AT_wiFiManager;
 
   ESP_AT_wiFiManager.setDebugOutput(true);

platformio/platformio.ini

@@ -54,7 +54,7 @@ lib_deps =
 build_flags =
 ; set your debug output (default=Serial)
 ; -D DEBUG_ESP_PORT=Serial
-; comment the folowing line to enable WiFi debugging
+; comment the following line to enable WiFi debugging
 ; -D NDEBUG
 
 [env:ESP8266]