Fix loader url composition on image/next doc

[valse]

Remove the extra slash to avoid double slashes on returned url (the image src prop needs to start with a slash)

[leerob]

the image src prop needs to start with a slash

Could you link to this? 🙏

[valse]

the image src prop needs to start with a slash

Could you link to this? 🙏

I'm confused with the default loader and I saw that the build in ones normalize the extra slash.

However the example in the doc add a double slash: I edited removing it from from the src attribute instead of in the loader function

[leerob]

Ahhh, okay I see what you meant now. Thank you!