Fix typo (reported by terlop on IRC)
diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index 5710c07..7fe164f 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -804,7 +804,7 @@
PyDoc_STRVAR(exec_doc,
"exec(object[, globals[, locals]])\n\
\n\
-Read and execute code from a object, which can be a string or a code\n\
+Read and execute code from an object, which can be a string or a code\n\
object.\n\
The globals and locals are dictionaries, defaulting to the current\n\
globals and locals. If only globals is given, locals defaults to it.");