Typo fixes and clarifications

README.md

@@ -92,7 +92,7 @@ $ scons
 The `$PSZ` script uses IDA Pro by default if it is setup properly.  You'll see the `meds-static` step replace the `rida` step.  
 If this step fails, make sure that IDA Pro is installed properly, and that you have started IDA Pro's GUI to accept the license agreement.
 
-The cookbook and other tools may use `pszr` to invoke zipr.  This command means "invoke Zipr with Rida" as the front end, or `$PSZ -c rida`.  If you've using `pszr` and wish to change
+The cookbook and other tools may use `pszr` to invoke Zipr.  This command means "invoke Zipr with Rida" as the front end, or `$PSZ -c rida`.  If you've using `pszr` and wish to change
 to IDA, just switch to `$PSZ`.
 
 
@@ -103,13 +103,13 @@ However, Zipr has at least some support for ARM32/64, MIPS32/64 and X86 32/64.
 Zipr _can_ run on ARM box, but has never been tested/built on a MIPS box.
 
 
-To make Zipr work on non-x86 binaries, you'll need to have completed these steps:
+To make Zipr run on an X86 machine with non-x86 binaries, you'll need to have completed these steps:
 
-* Built Zipr with IDA Pro support (ensure IDAROOT and IDASDK are set when running zipr).
-* Install core-utils and gcc for cross compilation.  For arm32 and arm64, you can use `sudo apt install binutils-aarch64-linux-gnu gcc-aarch64-linux-gnu`
+* Build Zipr with IDA Pro support (ensure IDAROOT and IDASDK are set when running Zipr).
+* Install core-utils and gcc for cross compilation.  For arm32 and arm64, you can use `sudo apt install binutils-aarch64-linux-gnu gcc-aarch64-linux-gnu`.  
 * Set the environment variables to specify that Zipr should use the cross-compilation tools.  In particular, set `PS_OBJDUMP`, `PS_READELF`, `PS_GCC`, `PS_OBJCOPY`, `PS_NM`, `PS_STRIP`.  
-For example, to use Zipr for the ARM architecture (32 or 64-bit) set `export PS_GCC=aarch64-linux-gnu-gcc` (and the other environment variables).
-This can be simplified with the `set-cross.sh` script by invoking it like so: `source set-cross.sh arm32` (or, substitute arm64, mips32,or  mips64.)
+For example, to use Zipr for the ARM architecture (32 or 64-bit), run `export PS_GCC=aarch64-linux-gnu-gcc` (and the other environment variables).
+This can be simplified with the `set-cross.sh` script by invoking it like so: `source set-cross.sh arm32` (or substitute, for e.g., arm64.)