STYLE: fix docs

Source/cmInstallFilesCommand.h

@@ -75,9 +75,9 @@ public:
       "Only files existing in the current source tree or its corresponding "
       "location in the binary tree may be listed.  "
       "If a file specified already has an extension, that extension will be "
-      "removed first.  This is useful for providing lists of source files such "
-      "as foo.cxx when you want the corresponding foo.h to be installed. A"
-      "typical extension is '.h'.\n"
+      "removed first.  This is useful for providing lists of source files "
+      "such as foo.cxx when you want the corresponding foo.h to be "
+      "installed. A typical extension is '.h'.\n"
       "  INSTALL_FILES(<dir> regexp)\n"
       "Any files in the current source directory that match the regular "
       "expression will be installed.\n"