Fix assorted typos.

From https://sourceforge.net/p/swig/patches/332/ and some others too.

Source/CParse/cscanner.c

@@ -9,7 +9,7 @@
  * scanner.c
  *
  * SWIG tokenizer.  This file is a wrapper around the generic C scanner
- * found in Swig/scanner.c.   Extra logic is added both to accomodate the
+ * found in Swig/scanner.c.   Extra logic is added both to accommodate the
  * bison-based grammar and certain peculiarities of C++ parsing (e.g.,
  * operator overloading, typedef resolution, etc.).  This code also splits
  * C identifiers up into keywords and SWIG directives.
@@ -373,7 +373,7 @@ void scanner_clear_rename() {
   rename_active = 0;
 }
 
-/* Used to push a ficticious token into the scanner */
+/* Used to push a fictitious token into the scanner */
 static int next_token = 0;
 void scanner_next_token(int tok) {
   next_token = tok;

Source/DOH/README

@@ -69,7 +69,7 @@ Close(obj)                      Close
 
 String Operations
 -----------------
-Replace(obj, orig, rep, flags)  Replace occurences of orig with rep.
+Replace(obj, orig, rep, flags)  Replace occurrences of orig with rep.
 Chop(obj)                       Remove trailing whitespace
 
 flags is one of the following:

Source/Modules/d.cxx

@@ -3625,7 +3625,7 @@ private:
       // If the import statement has been found in the target string, we have to
       // check if the previous import was static, which would lead to problems
       // if this import is not.
-      // Thus, we check if the seven characters in front of the occurence are
+      // Thus, we check if the seven characters in front of the occurrence are
       // »static «. If the import string passed is also static, the checks fail
       // even if the found statement is also static because the last seven
       // characters would be part of the previous import statement then.

Source/Modules/lua.cxx

@@ -113,7 +113,7 @@ private:
   String *s_var_tab;		// table of global variables
   String *s_const_tab;		// table of global constants
   String *s_methods_tab;	// table of class methods
-  String *s_attr_tab;		// table of class atributes
+  String *s_attr_tab;		// table of class attributes
   String *s_luacode;		// luacode to be called during init
   String *s_dot_get;            // table of variable 'get' functions
   String *s_dot_set;            // table of variable 'set' functions