wget: use long arguments (#5879)

pages/common/wget.md

@@ -10,7 +10,7 @@
 
 - Download the contents of an URL to a file (named "bar" in this case):
 
-`wget -O {{bar}} {{https://example.com/foo}}`
+`wget --output-document {{bar}} {{https://example.com/foo}}`
 
 - Download a single web page and all its resources with 3-second intervals between requests (scripts, stylesheets, images, etc.):
 
@@ -30,8 +30,8 @@
 
 - Continue an incomplete download:
 
-`wget -c {{https://example.com}}`
+`wget --continue {{https://example.com}}`
 
 - Download all URLs stored in a text file to a specific directory:
 
-`wget -P {{path/to/directory}} -i {{URLs.txt}}`
+`wget --directory-prefix {{path/to/directory}} --input-file {{URLs.txt}}`