docs: fix capitalization in doxygen comments

Change-Id: Ibf5ee5119d12d60d382b0acef8dfd08277c18fcb
diff --git a/tests/daemon/fw/choose-strategy.hpp b/tests/daemon/fw/choose-strategy.hpp
index 5416384..8fc1951 100644
--- a/tests/daemon/fw/choose-strategy.hpp
+++ b/tests/daemon/fw/choose-strategy.hpp
@@ -37,7 +37,7 @@
 
 namespace nfd::tests {
 
-/** \brief choose the strategy for a namespace
+/** \brief Choose the strategy for a namespace.
  *  \tparam S strategy type, must be a complete type
  *  \param forwarder the forwarder
  *  \param prefix namespace to choose the strategy for