Fix various issues with `gn analyze`.

tools/gn/command_analyze.cc

Index: tools/gn/command_analyze.cc
diff --git a/tools/gn/command_analyze.cc b/tools/gn/command_analyze.cc
index a9c0d9a7246084437514ef9b8af86b23ddacf3c6..03519cbd4aecec51cd448cb75fe4d2948be18f8d 100644
--- a/tools/gn/command_analyze.cc
+++ b/tools/gn/command_analyze.cc
@@ -34,27 +34,26 @@ const char kAnalyze_Help[] =
     "\n"
     "   - \"files\": A list of the filenames to check.\n"
     "\n"
-    "   - \"compile_targets\": A list of the labels targets that we wish to\n"
-    "     rebuild, but aren't necessarily needed for testing. The\n"
-    "     important difference between this field and \"test_targets\"\n"
-    "     is that if an item in the compile_targets list is a group, then\n"
+    "   - \"test_targets\": A list of the labels for targets that\n"
+    "     are needed to run the tests we wish to run.\n"
+    "\n"
+    "   - \"additional_compile_targets\": A list of the labels for\n"
+    "     targets that we wish to rebuild, but aren't necessarily needed\n"
+    "     for testing. The important difference between this field and\n"
+    "     \"test_targets\" is that if an item in the\n"
+    "     additional_compile_targets list refers to a group, then\n"
     "     any dependencies of that group will be returned if they are out\n"
     "     of date, but the group itself does not need to be. If the\n"
     "     dependencies themselves are groups, the same filtering is\n"
     "     repeated. This filtering can be used to avoid rebuilding\n"
     "     dependencies of a group that are unaffected by the input files.\n"
-    "     The list may contain the string \"all\" to refer to a\n"
-    "     pseudo-group that contains every root target in the build graph.\n"
+    "     The list may also contain the string \"all\" to refer to a\n"
+    "     pseudo-group that contains every root target in the build\n"
+    "     graph.\n"
     "\n"
     "     This filtering behavior is also known as \"pruning\" the list\n"
     "     of compile targets.\n"
     "\n"
-    "   - \"test_targets\": A list of the labels for targets that\n"
-    "     are needed to run the tests we wish to run. Unlike\n"
-    "     \"compile_targets\", this list may not contain the string \"all\",\n"
-    "     because having a test be dependent on everything in the build\n"
-    "     would be silly.\n"
-    "\n"
     "  output_path is a path indicating where the results of the command\n"
     "  are to be written. The results will be a file containing a JSON\n"
     "  object with one or more of following fields:\n"