Fix duplicated words and typos in comments and docs

[durvesh1992]

Summary

Fixes high-confidence text errors found by sweeping comments and Markdown docs across the repo: duplicated words and common misspellings. Comments and documentation only — no code or behavior changes.

Legitimate C++ tokens were deliberately left untouched (e.g. convertible to To, cast from From to To, folly::to to check, in in-situ-only), since To/From are type names, folly::to is a function, and in-situ is a hyphenated term.

Changes

Duplicated words

File	Before	After
folly/ConstructorCallbackList.h	that that callback code	that callback code
folly/Synchronized.h	is is nothrow-copy-constructible	is nothrow-copy-constructible
folly/Synchronized.h	passed to to *lock()	passed to *lock()
folly/Utility.h	used to to force a move	used to force a move
folly/Function.h	Why is is safe	Why is it safe
folly/result/rich_exception_ptr.h	but the the right	but the right
folly/memory/Allocator.h	which is is no longer	which is no longer
folly/test/StringToFloatBenchmark.cpp	for the the benchmark	for the benchmark
folly/hash/detail/ChecksumDetail.cpp	it is is reduced	it is reduced
folly/io/IOBuf.h	the the IOBuf's chain	the IOBuf's chain
folly/io/async/NotificationQueue.h	available on on older	available on older
folly/io/async/EventBase.h	with with no risk	with no risk
folly/io/async/Request.h	is the the same	is the same
folly/io/async/IoUring.h	member from from io_uring_cqe	member from io_uring_cqe
folly/io/async/AsyncSSLSocket.h	mimics what what	mimics what
folly/lang/bind/Bind.h	on on all the bindings	on all the bindings
folly/lang/bind/AsArgument.h	responsible for for the	responsible for the
folly/testing/TestUtil.h	is is guaranteed	is guaranteed
folly/container/FBVector.h	Note that that indeterminate	Note that indeterminate
folly/detail/ThreadLocalDetail.h	into the the elements array	into the elements array
folly/coro/Coroutine.h	with with a vtable	with a vtable
folly/coro/Collect.h	or the the exception	or the exception
folly/logging/xlog.h	then we we can detect	then we can detect
folly/logging/LogLevel.h	or to to main DBG level	or to main DBG level
folly/functional/Invoke.h	of the the specified types	of the specified types
folly/channels/MultiplexChannel-inl.h	receiver to to one or more	receiver to one or more
folly/ThreadCachedInt.h	it's fine do do a relaxed load	it's fine to do a relaxed load
folly/synchronization/DistributedMutex-inl.h	then were were not given	then we were not given
folly/docs/Hazptr.md	version of of shared-ptr	version of shared-ptr

Misspellings

File	Before	After
folly/test/SocketAddressTest.cpp	Comparision	Comparison
folly/fibers/async/Async.h	guarentee	guarantee
folly/concurrency/container/RelaxedConcurrentPriorityQueue.h	guarentee	guarantee
folly/concurrency/container/RelaxedConcurrentPriorityQueue.h	alway	always
folly/io/async/AsyncTransport.h	successfull	successful
folly/io/async/SSLContext.h	fucntion	function
folly/io/async/test/EventHandlerTest.cpp	Specificaly	Specifically
folly/docs/Switch.md	explicitely (3x)	explicitly
folly/synchronization/Rcu.h	occuring	occurring
folly/observer/test/ObserverTest.cpp	tha hazptr-obj	the hazptr-obj
folly/detail/test/ThreadLocalDetailTest.cpp	elemnts	elements

Verification

Inspection-only (C++ not built here). Each change was checked in context to confirm it is a genuine comment/doc typo and not a code identifier or technical term. Re-grepped after editing to confirm no remaining instances and that no code logic was modified.