[NFC][mlir][affine] Typo in Affine Analysis test

[Groverkss]

LGTM

mlir/unittests/Dialect/Affine/Analysis/AffineStructuresParserTest.cpp

 #include "mlir/Analysis/Presburger/PresburgerRelation.h"
 
 #include <gtest/gtest.h>
 
 using namespace mlir;
 using namespace presburger;
 
 /// Construct a IntegerPolyhedron from a set of inequality, equality, and
-/// division onstraints.
+/// division constraints.
 static IntegerPolyhedron makeFACFromConstraints(
     unsigned dims, unsigned syms, ArrayRef<SmallVector<int64_t, 4>> ineqs,
     ArrayRef<SmallVector<int64_t, 4>> eqs = {},
     ArrayRef<std::pair<SmallVector<int64_t, 4>, int64_t>> divs = {}) {
   IntegerPolyhedron fac(ineqs.size(), eqs.size(), dims + syms + 1,
                         PresburgerSpace::getSetSpace(dims, syms, 0));
   for (const auto &div : divs)
     fac.addLocalFloorDiv(div.first, div.second);
EXPECT_TRUE(failed(fac))
       << "should not accept strings that contain remaining characters";
 
   fac = parseIntegerSetToFAC("(x)[] : (x - >= 0)", &context, false);
   EXPECT_TRUE(failed(fac))
       << "should not accept strings that contain incomplete constraints";
 
   fac = parseIntegerSetToFAC("(x)[] : (y == 0)", &context, false);
   EXPECT_TRUE(failed(fac))
-      << "should not accept strings that contain unkown identifiers";
+      << "should not accept strings that contain unknown identifiers";
 
   fac = parseIntegerSetToFAC("(x, x) : (2 * x >= 0)", &context, false);
   EXPECT_TRUE(failed(fac))
       << "should not accept strings that contain repeated identifier names";
 
   fac = parseIntegerSetToFAC("(x)[x] : (2 * x >= 0)", &context, false);
   EXPECT_TRUE(failed(fac))
       << "should not accept strings that contain repeated identifier names";