[tig] typo in man tig

In man tig example section,

       Examples:


           set show-author = yes           # Show author?
           set show-date = yes             # Show commit date?
           set show-rev-graph = yes        # Show revision graph?
           set show-refs = yes             # Show references?
           set show-line-numbers = no      # Show line numbers?
           set author-width = 10           # Set width of the author column
           set line-graphics = no          # Disable graphics characters
           set line-number-interval = 5    # Interval between line numbers
           set tab-size = 8                # Number of spaces per tab
           set encoding = "UTF-8"          # Commit encoding  

the last variable should be commit-encoding

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