Fix typo in documentation

Signed-off-by: GwanYeong Kim <gy741.kim@gmail.com>

CONTRIBUTING.rst

@@ -77,7 +77,7 @@ copyright and the reference to the MIT License.
 
 5. Follow the Linux kernel coding style, which can be found in the file
    ``Documentation/process/coding-style.rst`` in the Linux kernel repository.
-   Note that the coding style isn't writen on stone, if there is a good reason
+   Note that the coding style isn't written in stone, if there is a good reason
    to deviate from it, it should be fine.
 
 6. Download the files ``checkpatch.pl``, ``const_structs.checkpatch`` and

docs/rgbasm.5.html

@@ -1303,7 +1303,7 @@ The most basic string expression is any number of characters contained in double
   </tr>
 </table>
 <div class="Pp"></div>
-A funky feature is <b class="Sy" title="Sy">{symbol}</b> withing a string. This
+A funky feature is <b class="Sy" title="Sy">{symbol}</b> within a string. This
   will examine the type of the symbol and insert its value accordingly. If
   symbol is a string symbol, the symbols value is simply copied. If it's a
   numeric symbol, the value is converted to hexadecimal notation and inserted as

src/asm/rgbasm.5

@@ -1075,7 +1075,7 @@ can use within a string:
 .Pp
 A funky feature is
 .Sy {symbol}
-withing a string.
+within a string.
 This will examine the type of the symbol and insert its value accordingly.
 If symbol is a string symbol, the symbols value is simply copied.
 If it's a numeric symbol, the value is converted to hexadecimal notation and