[Flag_descriptions] Fixed missing space when concatenating strings

Added a space to the end of a string so when concatenated the words are not directly joined.

Change-Id: Ia8d80398ad97fd1c45323faaf3e6b66c29020f05
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2576720Reviewed-by: Rachel Wong <wrong@chromium.org>
Commit-Queue: Ada Fang <adafang@google.com>
Cr-Commit-Position: refs/heads/master@{#834115}

chrome/browser/flag_descriptions.cc

@@ -2227,7 +2227,7 @@ const char kStoragePressureEventDescription[] =
 
 const char kSuggestedContentToggleName[] = "Enable Suggested Content toggle";
 const char kSuggestedContentToggleDescription[] =
-    "Enables a settings UI toggle that controls Suggested Content status. Also"
+    "Enables a settings UI toggle that controls Suggested Content status. Also "
     "enables a corresponding notice in the Launcher about Suggested Content.";
 
 const char kSuggestionsWithSubStringMatchName[] =