Fix some typos (#762)

src/bacnet/bacstr.c

@@ -345,7 +345,7 @@ bool bitstring_init_ascii(BACNET_BIT_STRING *bit_string, const char *ascii)
 
 #define CHARACTER_STRING_CAPACITY (MAX_CHARACTER_STRING_BYTES - 1)
 /**
- * Initialize a BACnet characater string.
+ * Initialize a BACnet character string.
  * Returns false if the string exceeds capacity.
  * Initialize by using value=NULL
  *
@@ -419,7 +419,7 @@ size_t characterstring_strnlen(const char *str, size_t maxlen)
 }
 
 /**
- * Initialize a BACnet characater string.
+ * Initialize a BACnet character string.
  * Returns false if the string exceeds capacity.
  * Initialize by using value=NULL
  *
@@ -438,7 +438,7 @@ bool characterstring_init_ansi_safe(
 }
 
 /**
- * Initialize a BACnet characater string.
+ * Initialize a BACnet character string.
  * Returns false if the string exceeds capacity.
  * Initialize by using value=NULL
  *