Review usage of "you" about english

[wilzbach]

While i think the first one is valid, the others slipped in?

>  grep -Hnr " we "
en/welcome/welcome-to-d.md:46:and we are glad about pull requests making this tour even better.
en/vibed/basics-asynchronous-i-o.md:19:every time a call to socket would block - because we don't
en/vibed/basics-asynchronous-i-o.md:23:operation. When the data is available we just
en/vibed/basics-asynchronous-i-o.md:28:    // we return here.
en/vibed/json-rest-interface.md:4:If we want to implement the following JSON output for
en/vibed/json-rest-interface.md:44:To actual fill the data structures, we have to inherit
en/vibed/json-rest-interface.md:53:Given an `URLRouter` instance we register
en/basics/alias-strings.md:3:Now that we know what arrays are, have gotten in touch of `immutable`
en/basics/structs.md:73:which we will see in a future section.
en/basics/structs.md:143:    // Thanks to toString() we can now just
en/basics/ranges.md:78:    // But we do want to touch all elements and
en/basics/delegates.md:99:    // we can ensure that the switch covers
en/basics/slices.md:53:call a sub-slice is taken thus we don't
en/basics/functions.md:94:    // Depending on the result we call one of
en/basics/arrays.md:113:    // Make sure we the algorithm works
en/gems/template-meta-programming.md:101:    /// we really hate boiler plate!
en/gems/template-meta-programming.md:143:    // we statically enabled it only for float's
en/gems/contract-programming.md:121:        // verify we return YYYY-MM-DD
en/gems/compile-time-function-evaluation-ctfe.md:59:    // approximation because we think the change
en/gems/range-algorithms.md:99:      // we don't need duplication, right?
en/multithreading/std-parallelism.md:120:    // Get our result we sent to background
en/multithreading/message-passing.md:133:    // And we wait until all threads have