Minor typo and wording fixes (#2991)

app/include/user_config.h

@@ -59,7 +59,7 @@
 
 
 // NodeMCU supports two file systems: SPIFFS and FATFS, the first is available
-// on all ESP8266 modules.  The latter requires extra H/W so is less common.
+// on all ESP8266 modules.  The latter requires extra H/W so it is less common.
 // If you use SPIFFS then there are a number of options which impact the
 // RAM overhead and performance of the file system.
 
@@ -87,7 +87,7 @@
 
 // The HTTPS stack requires client SSL to be enabled.  The SSL buffer size is
 // used only for espconn-layer secure connections, and is ignored otherwise.
-// Some HTTPS  applications require a larger buffer size to work.  See
+// Some HTTPS applications require a larger buffer size to work.  See
 // https://github.com/nodemcu/nodemcu-firmware/issues/1457 for details.
 // The SHA2 and MD2 libraries are also optionally used by the crypto functions.
 // The SHA1 and MD5 function are implemented in the ROM BIOS. The MD2 and SHA2
@@ -101,8 +101,8 @@
 
 // GPIO_INTERRUPT_ENABLE needs to be defined if your application uses the
 // gpio.trig() or related GPIO interrupt service routine code.  Likewise the
-// GPIO interrupt hook is requited for a few modules such as rotary.  If you
-// don't require this functionality, then commenting out these options out
+// GPIO interrupt hook is required for a few modules such as rotary.  If you
+// don't require this functionality, then commenting out these options
 // will remove any associated runtime overhead.
 
 #define GPIO_INTERRUPT_ENABLE
@@ -170,7 +170,7 @@
 #define I2C_MASTER_OLD_VERSION
 
 
-// The following sections are only relevent for those developers who are
+// The following sections are only relevant for those developers who are
 // developing modules or core Lua changes and configure how extra diagnostics
 // are enabled in the firmware. These should only be configured if you are
 // building your own custom firmware and have full access to the firmware