[llvm] NFC: Fix trivial typo in rst and td files

Differential Revision: https://reviews.llvm.org/D77469
diff --git a/llvm/test/TableGen/ConcatenatedSubregs.td b/llvm/test/TableGen/ConcatenatedSubregs.td
index b67d6b0..1e6c22b 100644
--- a/llvm/test/TableGen/ConcatenatedSubregs.td
+++ b/llvm/test/TableGen/ConcatenatedSubregs.td
@@ -91,7 +91,7 @@
 // CHECK-LABEL: SubRegIndex sub0:
 // CHECK-LABEL: SubRegIndex sub1:
 // CHECK-LABEL: SubRegIndex sub2:
-// Check infered indexes:
+// Check inferred indexes:
 // CHECK: SubRegIndex ssub1_ssub2:
 // CHECK: SubRegIndex ssub3_ssub4:
 // CHECK: SubRegIndex ssub0_ssub1_ssub2_ssub3: