Prepare release 0.8.1

Refs: #5250
Change-Id: I99931c1300cd752554aea764e9688d027b5de29e
diff --git a/docs/INSTALL.rst b/docs/INSTALL.rst
index 30dadaf..d1493dd 100644
--- a/docs/INSTALL.rst
+++ b/docs/INSTALL.rst
@@ -7,14 +7,10 @@
 ndn-cxx is built against a continuous integration system and has been tested on the
 following platforms:
 
-- Ubuntu 18.04
-- Ubuntu 20.04
-- Ubuntu 22.04
+- Ubuntu 18.04 / 20.04 / 22.04
 - Debian 11
 - CentOS Stream 9
-- macOS 10.15
-- macOS 11
-- macOS 12
+- macOS 10.15 / 11 / 12 / 13
 
 ndn-cxx is known to work on the following platforms, although they are not officially
 supported:
@@ -316,5 +312,5 @@
 
 .. code-block:: sh
 
-    CXXFLAGS="-O1 -g3" ./waf configure --debug --with-tests
-    ...
+    CXXFLAGS="-O1 -g3 -Wall" ./waf configure --debug --with-tests
+    ./waf