Misc. documentation and source comment typo fixes

Found via `codespell -q 3 -L uint,od,objext,ba,cmo,bae,ans,struc,fo,clos,goin,upto,thru`
Revert changes in previous commit

3 files changed, 3 insertions, 3 deletions

diff --git a/Doc/Manual/Extending.html b/Doc/Manual/Extending.html
index b01328380..5a640fbdc 100644
--- a/Doc/Manual/Extending.html
+++ b/Doc/Manual/Extending.html
@@ -3031,7 +3031,7 @@ virtual int functionWrapper(Node *n) {
   /* Close the function(error) */
   Printv(wrapper->code, "return ERROR;\n", "}\n", NIL);
 
-  /* final substititions if applicable */
+  /* final substitutions if applicable */
   ...
 
   /* Dump the function out */
diff --git a/Doc/Manual/Go.html b/Doc/Manual/Go.html
index cfa56dbcf..c28cc03e1 100644
--- a/Doc/Manual/Go.html
+++ b/Doc/Manual/Go.html
@@ -607,7 +607,7 @@ be checked dynamically.
 
 <p>
 In order to use C++ templates in Go, you must tell SWIG to create
-wrappers for a particular template instantation.  To do this, use
+wrappers for a particular template instantiation.  To do this, use
 the <tt>%template</tt> directive.
 
 
diff --git a/Doc/Manual/Python.html b/Doc/Manual/Python.html
index 5a3947d4d..ee443be53 100644
--- a/Doc/Manual/Python.html
+++ b/Doc/Manual/Python.html
@@ -4002,7 +4002,7 @@ class Go(object):
 
 <p>
 The class defines each method in two different ways. The first definition is replaced by the second definition and so the second definition is the one used when the method is called.
-While this possibly provides the best of both worlds, the time to import the module will be slighly slower when the class is defined due to the additional method definitions.
+While this possibly provides the best of both worlds, the time to import the module will be slightly slower when the class is defined due to the additional method definitions.
 </p>
 
 <p>