Fix typos

lib/wrappers/libffi/msvc/win32.c

@@ -90,7 +90,7 @@ noclean:
 
 // If the return value pointer is NULL, assume no return value.
 /*
-  Intel asm is weird. We have to explicitely specify 'DWORD PTR' in the nexr instruction,
+  Intel asm is weird. We have to explicitly specify 'DWORD PTR' in the nexr instruction,
   otherwise only one BYTE will be compared (instead of a DWORD)!
  */
 		cmp DWORD PTR [ebp + 24], 0

lib/wrappers/mysql.nim

@@ -790,7 +790,7 @@ proc server_init*(argc: cint, argv: cstringArray, groups: cstringArray): cint{.
 proc server_end*(){.cdecl, dynlib: lib, importc: "mysql_server_end".}
   # mysql_server_init/end need to be called when using libmysqld or
   #      libmysqlclient (exactly, mysql_server_init() is called by mysql_init() so
-  #      you don't need to call it explicitely; but you need to call
+  #      you don't need to call it explicitly; but you need to call
   #      mysql_server_end() to free memory). The names are a bit misleading
   #      (mysql_SERVER* to be used when using libmysqlCLIENT). So we add more general
   #      names which suit well whether you're using libmysqld or libmysqlclient. We

lib/wrappers/readline/history.nim

@@ -231,7 +231,7 @@ proc history_truncate_file*(a2: cstring, a3: cint): cint{.cdecl,
 #  -1) If there was an error in expansion.
 #   2) If the returned line should just be printed.
 #
-#  If an error ocurred in expansion, then OUTPUT contains a descriptive
+#  If an error occurred in expansion, then OUTPUT contains a descriptive
 #  error message. 
 
 proc history_expand*(a2: cstring, a3: cstringArray): cint{.cdecl, 

lib/wrappers/readline/tweaked/history.h

@@ -217,7 +217,7 @@ extern int history_truncate_file PARAMS((const char *, int));
   -1) If there was an error in expansion.
    2) If the returned line should just be printed.
 
-  If an error ocurred in expansion, then OUTPUT contains a descriptive
+  If an error occurred in expansion, then OUTPUT contains a descriptive
   error message. */
 extern int history_expand PARAMS((char *, char **));