Fixed a typo & updated spelling wordlist

Author: gsoldatov

docs/spelling_wordlist.txt

@@ -6,6 +6,7 @@ aiohttp
 aiohttpdemo
 aiohttp’s
 aiopg
+al
 alives
 api
 api’s
@@ -120,6 +121,7 @@ env
 environ
 eof
 epoll
+et
 etag
 ETag
 expirations
@@ -167,6 +169,7 @@ iterable
 iterables
 javascript
 Jinja
+jitter
 json
 keepalive
 keepalived
@@ -294,6 +297,7 @@ runtime
 runtimes
 sa
 Satisfiable
+scalability
 schemas
 sendfile
 serializable
@@ -350,6 +354,7 @@ unicode
 unittest
 Unittest
 unix
+unobvious
 unsets
 unstripped
 untyped

docs/web_reference.rst

@@ -1377,7 +1377,8 @@ content type and *data* encoded by ``dumps`` parameter
    This class should be used for the keys in :class:`Response`,
    :class:`FileResponse` and :class:`StreamResponse`. They provide
    a type-safe alternative to `str` keys when checking your code
-   with a type checker (e.g. mypy). They also avoid name clasheswith keys from different libraries etc.
+   with a type checker (e.g. mypy). They also avoid name clashes
+   with keys from different libraries etc.
 
    :param name: A name to help with debugging. This should be the same as
                 the variable name (much like how :class:`typing.TypeVar`