issues on readmes

subjects/how-2-js/README.md

@@ -8,7 +8,7 @@ to execute javascript.
 Being a special child, JS can run in different **runtime**, what you can
 do with it greatly depend of your runtime.
 
-Luckly you don't need to install anything for that since all you
+Luckily you don't need to install anything for that since all you
 need is a web browser.
 
 > Main runtime for executing JS are: any web browser, NodeJS and Deno.

subjects/more-or-less/README.md

@@ -5,9 +5,9 @@
 Create 4 functions
 
 - `more` that takes 1 argument and add 1 to it
-- `less` that takes 1 argument and substract 1 to it
+- `less` that takes 1 argument and subtract 1 to it
 - `add` that takes 2 arguments and add them
-- `sub` that takes 2 arguments and substract them
+- `sub` that takes 2 arguments and subtract them
 
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