update llhttp to v6.0.7; README typo.

README.md

@@ -217,8 +217,8 @@ the source directories which contain your modifications_.
 The above script installs the executable file "`uxplay`" to `/usr/local/bin`, (and installs a manpage to
 somewhere like `/usr/local/share/man/man1` and README
 files to somewhere like `/usr/local/share/doc/uxplay`).
-It can also be found in the build directory after the build
-processs.
+The uxplay executable  can also be found in the build directory after the build
+processs, if you wish to test before installing.
 
 **Finally, run uxplay in a terminal window**.  Use Ctrl-C (or close the window) to terminate it when done. If it is not seen by the
 iOS client's drop-down "Screen Mirroring" panel, check that your DNS-SD
@@ -418,7 +418,7 @@ which will not work if a firewall is running.
    
 **-vd _decoder_** chooses the GStreamer pipeline's h264 decoder element, instead of letting
    decodebin pick it for you.  Software decoding is done by avdec_h264; various hardware decoders
-   include: vaapi264dec, nvdec, nvh264dec, v4l2h264dec (these require that the appropriate hardware is
+   include: vaapih264dec, nvdec, nvh264dec, v4l2h264dec (these require that the appropriate hardware is
    available).  Using quotes "..." allows some parameters to be included with the decoder name.
 
 **-vc _converter_** chooses the GStreamer pipeline's videoconverter element, instead of the default
@@ -690,7 +690,7 @@ The "features" code and other settings are set in `UxPlay/lib/dnssdint.h`.
 
 # ChangeLog
 1.55 2022-07-04   Remove the bt709 fix from -v4l2 and  create a new -bt709 option (previous
-                  "-v4l2" is now "-v4l2 -bt709".  This allows the currently-required -bt709 
+                  "-v4l2" is now "-v4l2 -bt709").  This allows the currently-required -bt709 
                   option to be used on its own on RPi without -v4l2 (sometimes this give better results). 
 
 1.54 2022-06-25   Add support for "Cover Art" display in Audio-only (ALAC) mode. Reverted a change