Merge pull request #322 from himorin/fix-typo-20220105

possible editorial fix of English?

index.html

@@ -3930,7 +3930,7 @@ <h4 id="positioning_of_groupruby_with_respect_to_base_characters">
         <p its-locale-filter-list="en" lang="en"> In letterpress printing, there were not many choices for adjustment of inter-character spacing between ruby characters. Therefore,
           depending on the number of characters in the base text and its ruby text, the choice was whether to add a certain amount of space
           before the leading ruby character and after the trailing character, or not. In the former case it had been said that for 2
-          units of inter-character spacing between each c ruby characters, adding 1 unit of the leading and trailing spacing would
+          units of inter-character spacing between each adjacent ruby characters, adding 1 unit of the leading and trailing spacing would
           give a balanced appearance. </p>
         <p its-locale-filter-list="ja" lang="ja">活字組版では，ルビ文字の字間調整が細かくできない場合も多く，親文字とルビ文字の字数に応じて，適宜ルビ文字の文字列の先頭及び末尾を空けない方法と空ける方法を選択して行ってきた．また，ルビ文字の文字列の先頭及び末尾を空ける場合は，ルビ文字の文字列の字間の空き量の大きさ2に対して，その先頭及び末尾の空き量を1の比率で空けると体裁がよい，といわれていた．</p>
       </aside>