Fix typos

doc/advopt.txt

@@ -18,7 +18,7 @@ Advanced commands:
                             track a file, currently not saved to disk
     --suggest               suggest all possible symbols at position
     --def                   list all possible definitions at position
-    --context               list possible invokation context
+    --context               list possible invocation context
     --usages                list all usages of the symbol at position
     --eval                  evaluates an expression
   //serve                   start the compiler as a service mode (CAAS)

doc/idetools.txt

@@ -27,7 +27,7 @@ integrations <https://github.com/Araq/Nim/wiki/Editor-Support>`_
 already available.
 
 
-Idetools invokation
+Idetools invocation
 ===================
 
 Specifying the location of the query
@@ -35,7 +35,7 @@ Specifying the location of the query
 
 All of the available idetools commands require you to specify a
 query location through the ``--track`` or ``--trackDirty`` switches.
-The general idetools invokations are::
+The general idetools invocations are::
 
     nim idetools --track:FILE,LINE,COL <switches> proj.nim
 
@@ -129,7 +129,7 @@ the suggestions sorted first by scope (from innermost to outermost)
 and then by item name.
 
 
-Invokation context
+Invocation context
 ------------------
 
 The ``--context`` idetools switch is very similar to the suggestions

doc/intern.txt

@@ -236,7 +236,7 @@ too. Type converters fall into this category:
 
 If in the above example module ``B`` is re-compiled, but ``A`` is not then
 ``B`` needs to be aware of ``toBool`` even though  ``toBool`` is not referenced
-in ``B`` *explicitely*. 
+in ``B`` *explicitly*. 
 
 Both the multi method and the type converter problems are solved by storing 
 them in special sections in the ROD file that are loaded *unconditionally*