fix spelling mistakes in docs (#5952)

Signed-off-by: hwdef <hwdef97@gmail.com>

docs/configuration/configuration.md

@@ -1297,7 +1297,7 @@ queue_config:
   # Number of samples to buffer per shard before we block reading of more
   # samples from the WAL. It is recommended to have enough capacity in each
   # shard to buffer several requests to keep throughput up while processing
-  # occassional slow remote requests.
+  # occasional slow remote requests.
   [ capacity: <int> | default = 500 ]
   # Maximum number of shards, i.e. amount of concurrency.
   [ max_shards: <int> | default = 1000 ]

tsdb/CHANGELOG.md

@@ -91,7 +91,7 @@
    - `OpenBlock` signature changed to take a logger.
  - [REMOVED] `PrefixMatcher` is considered unused so was removed.
  - [CLEANUP] `Options.WALFlushInterval` is removed as it wasn't used anywhere.
- - [FEATURE] Add new `LiveReader` to WAL pacakge. Added to allow live tailing of a WAL segment, used by Prometheus Remote Write after refactor. The main difference between the new reader and the existing `Reader` is that for `LiveReader` a call to `Next()` that returns false does not mean that there will never be more data to read.
+ - [FEATURE] Add new `LiveReader` to WAL package. Added to allow live tailing of a WAL segment, used by Prometheus Remote Write after refactor. The main difference between the new reader and the existing `Reader` is that for `LiveReader` a call to `Next()` that returns false does not mean that there will never be more data to read.
 
 ## 0.3.1
 

tsdb/head.go

@@ -1046,7 +1046,7 @@ func (h *Head) gc() {
 	h.metrics.seriesRemoved.Add(float64(seriesRemoved))
 	h.metrics.chunksRemoved.Add(float64(chunksRemoved))
 	h.metrics.chunks.Sub(float64(chunksRemoved))
-	// Using AddUint64 to substract series removed.
+	// Using AddUint64 to subtract series removed.
 	// See: https://golang.org/pkg/sync/atomic/#AddUint64.
 	atomic.AddUint64(&h.numSeries, ^uint64(seriesRemoved-1))