Fix typo in inflate stream doc

Signed-off-by: Damian Jarek <[email protected]>

include/boost/beast/zlib/inflate_stream.hpp

@@ -182,7 +182,7 @@ class inflate_stream
  the effects of the flush parameter in this implementation are on the return value
  of `write` as noted below, when `write` returns early when `Flush::block` or
  `Flush::trees` is used, and when `write` avoids the allocation of memory for a
- sliding window when `Flush::finsih` is used.
+ sliding window when `Flush::finish` is used.
 
  If a preset dictionary is needed after this call,
  `write` sets `zs.adler` to the Adler-32 checksum of the dictionary chosen by