Typos and minor errors in WinMerge manual

[jarmisteadgal]

From online documentation:

https://manual.winmerge.org/en/Compare_files.html#Compare_files_syncpoints

For section 4, which the content is still TBD, the word the heading is missing the "h" and should read "Synchronization"

From online documentation:

https://manual.winmerge.org/en/Compare_files.html#Compare_files_merge

In section 5.1, there is a word duplication error:

"Rescanning keeps your your compare and merge operations up to date."

[sdottaka]

These typos were fixed in commit 576e3fe.
Thank you for reporting them.