A few more User Guide edits.

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7240 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

doc/user_guide/en/controls-functions-messages.adoc

@@ -50,6 +50,6 @@ spaces) in the *Free Msg* box.
 pre-stored macro.  Pressing *Enter* on a modified message here
 automatically adds that message to the table of stored macros.
 
-IMPORTANT: During a transmission the actual message being sent always
+TIP: During a transmission the actual message being sent always
 appears in the first box of the status bar (bottom left of the main
 screen).

doc/user_guide/en/introduction.adoc

@@ -37,7 +37,7 @@ duration.  User messages are transmitted repeatedly at high rate (up
 to 250 characters per second, for MSK144) to make good use of the
 shortest meteor-trail reflections or "`pings`".  ISCAT uses free-form
 messages up to 28 characters long, while MSK144 uses the same
-structured messages as the slow modes together with an abbreviated
+structured messages as the slow modes and optionally an abbreviated
 format with hashed callsigns.  
 
 *WSPR* (pronounced "`whisper`") stands for **W**eak **S**ignal
@@ -46,7 +46,7 @@ potential propagation paths using low-power transmissions. WSPR
 messages normally carry the transmitting station’s callsign, grid
 locator, and transmitter power in dBm, and they can be decoded at
 signal-to-noise ratios as low as -28 dB in a 2500 Hz bandwidth.  WSPR
-users with internet access can automatically upload their reception
+users with internet access can automatically upload reception
 reports to a central database called {wsprnet} that provides a mapping
 facility, archival storage, and many other features.
 

doc/user_guide/en/new_features.adoc

@@ -7,24 +7,26 @@ added to _WSJT-X_ since Version 1.6.0:
 
 - Newly implemented submodes: JT65B-C, JT9B-H
 
-- New fast submodes of JT9E-H
+- Fast submodes of JT9E-H
 
-- New Franke-Taylor decoder to replace the Koetter-Vardy decoder in
-JT65. Separate program `kvasd[.exe]` is no longer used.
+- New Franke-Taylor decoder to replace the Koetter-Vardy decoder
+previously used for JT65. Separate program `kvasd[.exe]` is no longer
+used.
 
 - Improvements to the JT4, JT9, and JT65 decoders
 
-- Multi-pass decoding for JT65 and WSPR.  Strong decoded signals are
-subtracted out, allowing the decoding of weaker signals.
+- Multi-pass decoding for JT65 and WSPR.  Decoded signals are
+subtracted from the received data, allowing decoding of weaker
+signals that were otherwise masked.
 
 - Improved convenience features for EME Doppler tracking
 
 - Saving and restoring of multiple program configurations
 
-- New sample-file download facility
+- Sample-file download facility
 
 - Many corrections and improvements to the Hamlib library, fixing
 balky rig-control features
 
-- Power settings for Transmit and Tune optionally remembered for 
-each band.
+- Power settings for Transmit and Tune remembered and optionally
+restored for each band

doc/user_guide/en/system-requirements.adoc

@@ -2,8 +2,8 @@
 
 - SSB transceiver and antenna 
 - Computer running Windows (XP or later), Linux, or OS X
-- 1.5 GHz or faster CPU and 200 MB of available memory
-- MSK144 benefits greatly from a multi-core CPU
+- 1.5 GHz or faster CPU and 200 MB of available memory.  (MSK144
+especially benefits from a multi-core CPU)
 - Monitor with at least 1024 x 780 resolution
 - Computer-to-radio interface using a serial port or equivalent USB 
   device for T/R switching, or CAT control, or VOX, as required for