docs: fix overwrite vs. override confusion in php-fpm.conf

overwrite: "to write on or over; cover with writing" [1]
override:  "to take precedence over; preempt or supersede" [2]

1. https://www.dictionary.com/browse/overwrite
2. https://www.dictionary.com/browse/override

Signed-off-by: Carlos Santos <unixmania@gmail.com>

package/php/files/php-fpm.conf

@@ -359,7 +359,7 @@ chdir = /
 ;env[TEMP] = /tmp
 
 ; Additional php.ini defines, specific to this pool of workers. These settings
-; overwrite the values previously defined in the php.ini. The directives are the
+; override the values previously defined in the php.ini. The directives are the
 ; same as the PHP SAPI:
 ;   php_value/php_flag             - you can set classic ini defines which can
 ;                                    be overwritten from PHP call 'ini_set'. 
@@ -369,7 +369,7 @@ chdir = /
 
 ; Defining 'extension' will load the corresponding shared extension from
 ; extension_dir. Defining 'disable_functions' or 'disable_classes' will not
-; overwrite previously defined php.ini values, but will append the new value
+; override previously defined php.ini values, but will append the new value
 ; instead.
 
 ; Note: path INI options can be relative and will be expanded with the prefix