DOCS-8647 fix missing space before footnote

Author: kay-kim

source/release-notes/3.3-dev-series-collation.txt

@@ -941,7 +941,7 @@ Supported Languages and Locales
 MongoDB's collation feature supports the following languages. The
 following table lists the supported languages and the associated
 locales as defined by `ICU Locale
-ID <http://userguide.icu-project.org/locale>`_.[#missing-locale]_
+ID <http://userguide.icu-project.org/locale>`_. [#missing-locale]_
 
 .. list-table::
    :class: index-table index-table-less-padding