[docs] Fix a typo: iteratation -> iteration

Reviewers: dgross

Reviewed By: dgross

Subscribers: dgross, llvm-commits

Differential Revision: https://reviews.llvm.org/D35822

llvm-svn: 308994
diff --git a/llvm/docs/ProgrammersManual.rst b/llvm/docs/ProgrammersManual.rst
index d115a9c..501b5c0 100644
--- a/llvm/docs/ProgrammersManual.rst
+++ b/llvm/docs/ProgrammersManual.rst
@@ -2105,7 +2105,7 @@
 StringMap also provides query methods that take byte ranges, so it only ever
 copies a string if a value is inserted into the table.
 
-StringMap iteratation order, however, is not guaranteed to be deterministic, so
+StringMap iteration order, however, is not guaranteed to be deterministic, so
 any uses which require that should instead use a std::map.
 
 .. _dss_indexmap: