Merge pull request scala#3040 from ivan-mashonskiy/patch-1

Fix typo

Author: Philippus

_overviews/collections-2.13/maps.md

@@ -64,7 +64,7 @@ Mutable maps support in addition the operations summarized in the following tabl
 |**Additions and Updates:**||
 |`ms(k) = v`|(Or, written out, `ms.update(k, v)`). Adds mapping from key `k` to value `v` to map ms as a side effect, overwriting any previous mapping of `k`.|
 |`ms.addOne(k -> v)`<br>or `ms += (k -> v)`|Adds mapping from key `k` to value `v` to map `ms` as a side effect and returns `ms` itself.|
-|`ms.addAll(xvs)`<br>or `ms ++= kvs`|Adds all mappings in `kvs` to `ms` as a side effect and returns `ms` itself.|
+|`ms.addAll(kvs)`<br>or `ms ++= kvs`|Adds all mappings in `kvs` to `ms` as a side effect and returns `ms` itself.|
 |`ms.put(k, v)`|Adds mapping from key `k` to value `v` to `ms` and returns any value previously associated with `k` as an option.|
 |`ms.getOrElseUpdate(k, d)`|If key `k` is defined in map `ms`, return its associated value. Otherwise, update `ms` with the mapping `k -> d` and return `d`.|
 |**Removals:**||

_overviews/collections-2.13/seqs.md

@@ -103,7 +103,7 @@ Two often used implementations of buffers are `ListBuffer` and `ArrayBuffer`. A
 | ------ | ------ |
 |**Additions:**||
 |`buf.append(x)`<br>or `buf += x`|Appends element `x` to buffer, and returns `buf` itself as result.|
-|`buf.appendAll(xs)`<br>or`buf ++= xs`|Appends all elements in `xs` to buffer.|
+|`buf.appendAll(xs)`<br>or`buf ++= xs`|Appends all elements in `xs` to buffer.|
 |`buf.prepend(x)`<br>or `x +=: buf`|Prepends element `x` to buffer.|
 |`buf.prependAll(xs)`<br>or `xs ++=: buf`|Prepends all elements in `xs` to buffer.|
 |`buf.insert(i, x)`|Inserts element `x` at index `i` in buffer.|