Fix typos in docs and comments

Doc/Devel/plan-gsoc-2012.txt

@@ -75,7 +75,7 @@ Functionality
   https://www.doxygen.nl/manual/commands.html. If a tag is
   marked as 'ignored', then the tag is ignored, but the text is copied
   to the destination documentation. 'Not implemented' means that the
-  tag with it's contents is stripped out of the output.
+  tag with its contents is stripped out of the output.
 
     Doxygen tags:
     

Doc/Manual/Doxygen.html

@@ -181,7 +181,7 @@ or enum element comments:
 <div class="code"><pre>
 enum E_NUMBERS
 {
-    EN_ZERO, ///&lt; The first enum item, gets zero as it's value
+    EN_ZERO, ///&lt; The first enum item, gets zero as its value
     EN_ONE, ///&lt; The second, EN_ONE=1
     EN_THREE
 };

Doc/Manual/Java.html

@@ -644,7 +644,7 @@ java::
 
 <p>
 To build the DLL and compile the java code, run NMAKE (you may need to run <tt>vcvars32</tt> first). 
-This is a pretty simplistic Makefile, but hopefully its enough to get you started.
+This is a pretty simplistic Makefile, but hopefully it's enough to get you started.
 Of course you may want to make changes for it to work for C++ by adding in the -c++ command line option for swig and replacing .c with .cxx.
 </p>
 

Doc/Manual/Lua.html

@@ -1520,7 +1520,7 @@ function
 nil
 >
 </pre></div>
-<p> This behaviour was changed. Now unless -squash-bases option is provided, Derived store a list of it's bases and if some symbol is not found in it's own service tables
+<p> This behaviour was changed. Now unless -squash-bases option is provided, Derived stores a list of its bases and if some symbol is not found in its own service tables
 then its bases are searched for it. Option -squash-bases will effectively return old behaviour.
 </p>
 
@@ -1638,7 +1638,7 @@ More details can be found in the <a href="Library.html#Library_carrays">carrays.
 
 <div class="code"><pre>// using the C-array
 %include &lt;carrays.i&gt;
-// this declares a batch of function for manipulating C integer arrays
+// this declares a batch of functions for manipulating C integer arrays
 %array_functions(int, int)
 
 extern void sort_int(int* arr, int len); // the function to wrap
@@ -1997,10 +1997,10 @@ So when 'p:Print()' is called, the __index looks on the object metatable for a '
 In theory, you can play with this usertable &amp; add new features, but remember that it is a shared table between all instances of one class, and you could very easily corrupt the functions in all the instances.
 </p>
 <p>
-Note: Both the opaque structures (like the FILE*) and normal wrapped classes/structs use the same 'swig_lua_userdata' structure. Though the opaque structures has do not have a metatable attached, or any information on how to dispose of them when the interpreter has finished with them.
+Note: Both the opaque structures (like the FILE*) and normal wrapped classes/structs use the same 'swig_lua_userdata' structure. Though the opaque structures do not have a metatable attached, or any information on how to dispose of them when the interpreter has finished with them.
 </p>
 <p>
-Note: Operator overloads are basically done in the same way, by adding functions such as '__add' &amp; '__call' to the class' metatable. The current implementation is a bit rough as it will add any member function beginning with '__' into the metatable too, assuming its an operator overload.
+Note: Operator overloads are basically done in the same way, by adding functions such as '__add' &amp; '__call' to the class' metatable. The current implementation is a bit rough as it will add any member function beginning with '__' into the metatable too, assuming it's an operator overload.
 </p>
 <H3><a name="Lua_nn38">29.7.3 Memory management</a></H3>
 

Doc/Manual/Perl5.html

@@ -2319,7 +2319,7 @@ typedef struct {
 
 <p>
 By default, SWIG doesn't know how to the handle the values structure
-member it's an array, not a pointer.  In this case, SWIG makes the array member
+member because it's an array, not a pointer.  In this case, SWIG makes the array member
 read-only.   Reading will simply return a pointer to the first item in the array.
 To make the member writable, a "memberin" typemap can be used.
 </p>
@@ -2747,7 +2747,7 @@ from the internal <tt>%OWNER</tt> hash).
 The <tt>%OWNER</tt> hash is an implementation detail, discussed here
 only to help clarify the operation of <tt>ACQUIRE</tt> and <tt>DISOWN</tt>.
 You should not access <tt>%OWNER</tt> directly - the details of how it
-works (and possibly even its existence) may chance in future SWIG versions.
+works (and possibly even its existence) may change in future SWIG versions.
 </p>
 
 <div class="targetlang"><pre>

Doc/Manual/Tcl.html

@@ -636,7 +636,7 @@ tcl:
 
 <p>
 To build the extension, run NMAKE (you may need to run vcvars32
-first).  This is a pretty minimal Makefile, but hopefully its enough
+first).  This is a pretty minimal Makefile, but hopefully it's enough
 to get you started.  With a little practice, you'll be making lots of
 Tcl extensions.
 </p>