Fix various typos

Found via `codespell -q 3 -S ./deps -L fo,numer,te,uint,wille`

Closes #1965

include/GLFW/glfw3.h

@@ -375,7 +375,7 @@ extern "C" {
  *
  *  The naming of the key codes follow these rules:
  *   - The US keyboard layout is used
- *   - Names of printable alpha-numeric characters are used (e.g. "A", "R",
+ *   - Names of printable alphanumeric characters are used (e.g. "A", "R",
  *     "3", etc.)
  *   - For non-alphanumeric characters, Unicode:ish names are used (e.g.
  *     "COMMA", "LEFT_SQUARE_BRACKET", etc.). Note that some names do not

src/win32_platform.h

@@ -428,7 +428,7 @@ typedef struct _GLFWwindowWin32
 
     // The last received cursor position, regardless of source
     int                 lastCursorPosX, lastCursorPosY;
-    // The last recevied high surrogate when decoding pairs of UTF-16 messages
+    // The last received high surrogate when decoding pairs of UTF-16 messages
     WCHAR               highSurrogate;
 } _GLFWwindowWin32;