rustdoc: use `<wbr>` in sidebar headers

This also improves sidebar layout, so instead of

    BTreeM
    ap

you get this

    BTree
    Map

1 files changed, 1 insertions, 1 deletions

diff --git a/src/librustdoc/html/templates/page.html b/src/librustdoc/html/templates/page.html
index cdf01fa7a97..65c4304e202 100644
--- a/src/librustdoc/html/templates/page.html
+++ b/src/librustdoc/html/templates/page.html
@@ -98,7 +98,7 @@
             </a> {# #}
             {% endif %}
             <h2> {# #}
-                <a href="{{page.root_path|safe}}{{display_krate_with_trailing_slash|safe}}index.html">{{display_krate}}</a> {# #}
+                <a href="{{page.root_path|safe}}{{display_krate_with_trailing_slash|safe}}index.html">{{display_krate|wrapped|safe}}</a> {# #}
                 {% if !display_krate_version_number.is_empty() %}
                     <span class="version">{{+ display_krate_version_number}}</span>
                 {% endif %}