Enable misspell check in golangci-lint (#10393)

Signed-off-by: Łukasz Mierzwa <l.mierzwa@gmail.com>

.golangci.yml

@@ -13,6 +13,7 @@ linters:
     - gofumpt
     - goimports
     - revive
+    - misspell
 
 issues:
   exclude-rules:

model/labels/labels_test.go

@@ -548,7 +548,7 @@ func TestLabels_Get(t *testing.T) {
 
 // BenchmarkLabels_Get was written to check whether a binary search can improve the performance vs the linear search implementation
 // The results have shown that binary search would only be better when searching last labels in scenarios with more than 10 labels.
-// In the following list, `old` is the linear search while `new` is the binary search implementaiton (without calling sort.Search, which performs even worse here)
+// In the following list, `old` is the linear search while `new` is the binary search implementation (without calling sort.Search, which performs even worse here)
 // name                                        old time/op    new time/op    delta
 // Labels_Get/with_5_labels/get_first_label      5.12ns ± 0%   14.24ns ± 0%   ~     (p=1.000 n=1+1)
 // Labels_Get/with_5_labels/get_middle_label     13.5ns ± 0%    18.5ns ± 0%   ~     (p=1.000 n=1+1)

tsdb/agent/db_test.go

@@ -177,7 +177,7 @@ func TestCommit(t *testing.T) {
 		}
 	}
 
-	// Check that the WAL contained the same number of commited series/samples/exemplars.
+	// Check that the WAL contained the same number of committed series/samples/exemplars.
 	require.Equal(t, numSeries, walSeriesCount, "unexpected number of series")
 	require.Equal(t, numSeries*numDatapoints, walSamplesCount, "unexpected number of samples")
 	require.Equal(t, numSeries*numDatapoints, walExemplarsCount, "unexpected number of exemplars")

tsdb/head_test.go

@@ -2969,7 +2969,7 @@ func TestSnapshotError(t *testing.T) {
 	}
 	head.tombstones.AddInterval(1, itvs...)
 
-	// Check existance of data.
+	// Check existence of data.
 	require.NotNil(t, head.series.getByHash(lbls.Hash(), lbls))
 	tm, err := head.tombstones.Get(1)
 	require.NoError(t, err)