docs(readme): improve wording in install and test sections

Author: rdavid

README.adoc

@@ -157,7 +157,7 @@ git clone git@github.com:rdavid/shellbase.git &&
   ./shellbase/app/install
 ----
 
-Install the file from the released version.
+Install the file from a release.
 Some operating systems demand administrative rights to install to
 `/usr/local/bin`; use `sudo` or `doas` before `tar`:
 
@@ -231,7 +231,7 @@ Output:
 
 == Test
 
-The project uses Daniel J. Bernstein's build system {url-redo}[`redo`].
+The project uses Daniel J. Bernstein's build system, {url-redo}[`redo`].
 You can install Sergey Matveev's {url-goredo}[`goredo`] implementation.
 `redo lint` applies the following linters to the source files:
 {url-actionlint}[`actionlint`],
@@ -243,9 +243,9 @@ You can install Sergey Matveev's {url-goredo}[`goredo`] implementation.
 {url-typos}[`typos`],
 {url-vale}[`vale`],
 {url-yamllint}[`yamllint`].
-`redo test` runs unit tests in installed shells.
+`redo test` runs unit tests across installed shells.
 `redo test-container` runs the tests across various shells in containers.
-It uses {url-cv}[David Rabkin]'s {url-goredoer}[`goredoer`] to build
+The project uses {url-cv}[David Rabkin]'s {url-goredoer}[`goredoer`] to build
 {url-goredo}[`goredo`].
 
 == Links