Bring consistency of formatting to ch-* sheets

sheets/ch-build

@@ -2,7 +2,6 @@
 # Utility to build a Charliecloud image and place it in the builder’s back-end
 # storage. More information: <https://github.com/hpc/charliecloud>.
 
-# Create an image tagged foo and specified by the file /bar/Dockerfile.
+# Create an image tagged foo and specified by the file /bar/Dockerfile. Use
-# Use /bar as the Docker context directory. Use the default builder.
+# /bar as the Docker context directory. Use the default builder.
 ch-build -t foo --file=/bar/Dockerfile /bar
-

sheets/ch-build2dir

@@ -2,7 +2,6 @@
 # Utility to build a Charliecloud image from Dockerfile and unpack it into a
 # directory. More information: <https://github.com/hpc/charliecloud>.
 
-# Build a Charliecloud image using ./Dockerfile.foo and create image
+# Build a Charliecloud image using './Dockerfile.foo' and create image
-# directory /var/tmp/foo
+# directory '/var/tmp/foo'.
 ch-build2dir -t foo -f ./Dockerfile.foo . /var/tmp
-

sheets/ch-builder2squash

@@ -2,7 +2,6 @@
 # Utility to flatten a builder image into a Charliecloud SquashFS file.
 # More information: <https://github.com/hpc/charliecloud>.
 
-# Flattens the builder image tagged "debian" into a SquashFS file named
+# Flattens the builder image tagged 'debian' into a SquashFS file named
-# debian.sqfs in /var/tmp.
+# 'debian.sqfs' in '/var/tmp'.
 ch-builder2squash debian /var/tmp
-

sheets/ch-builder2tar

@@ -2,7 +2,6 @@
 # Utility to flatten a builder image into a Charliecloud image tarball.
 # More information: <https://github.com/hpc/charliecloud>.
 
-# Flatten the builder image tagged "hello" into a Charliecloud tarball in
+# Flatten the builder image tagged 'hello' into a Charliecloud tarball in
-# directory /var/tmp
+# directory '/var/tmp'.
 ch-builder2tar hello /var/tmp
-

sheets/ch-dir2squash

@@ -2,7 +2,6 @@
 # Utility to create a SquashFS file from a Charliecloud image directory.
 # More information: <https://github.com/hpc/charliecloud>.
 
-# Create a Charliecloud SquashFS file debian.sqfs under the directory /var/tmp
+# Create a Charliecloud SquashFS file debian.sqfs under the directory
-# from the image directory /var/tmp/debian.
+# '/var/tmp' from the image directory '/var/tmp/debian'.
 ch-dir2squash /var/tmp/debian /var/tmp
-

sheets/ch-grow

@@ -3,10 +3,8 @@
 # It is completely unprivileged, with no setuid/setgid/setcap helpers.
 # More information: <https://github.com/hpc/charliecloud>.
 
-# Build the image "bar" using ./foo/bar/Dockerfile and context directory
+# Build image 'bar' using './foo/bar/Dockerfile' and context dir './foo/bar'.
-# ./foo/bar
 ch-grow build -t bar -f ./foo/bar/Dockerfile ./foo/bar
 
-# Download the Debian Buster image and place it in /tmp/buster.
+# Download the Debian Buster image and place it in '/tmp/buster'.
 ch-grow pull debian:buster /tmp/buster
-

sheets/ch-mount

@@ -2,7 +2,6 @@
 # Utility to mount a SquashFS image file using FUSE.
 # More information: <https://github.com/hpc/charliecloud>.
 
-# Create a new empty directory named debian, then mount it on /var/tmp
+# Create a new empty directory named 'debian', then mount it to '/var/tmp'. The
-# directory. The /var/tmp directory must not already exist.
+# '/var/tmp' directory must not already exist.
 ch-mount /var/tmp/debian.sqfs /var/tmp
-

sheets/ch-pull2dir

@@ -2,7 +2,6 @@
 # Utility to pull an image from the Docker Hub and unpack it into a directory.
 # More information: <https://github.com/hpc/charliecloud>.
 
-# Pull Docker image named alpine:latest from Docker Hub and extract it into
+# Pull Docker image named 'alpine:latest' from Docker Hub, then extract it into
-# a subdirectory of /var/tmp. A temporary tarball will be stored in /var/tmp.
+# a subdirectory named '/var/tmp', in which a temporary tarball will be stored.
 ch-pull2dir alpine:latest /var/tmp
-

sheets/ch-pull2tar

@@ -2,7 +2,6 @@
 # Utility to pull an image from the Docker Hub and flatten it into a tarball.
 # More information: <https://github.com/hpc/charliecloud>.
 
-# Pull a Docker image named alpine:latest from Docker Hub and flatten it into
+# Pull a Docker image named 'alpine:latest' from Docker Hub and flatten it into
-# a Charliecloud tarball in the directory /var/tmp.
+# a Charliecloud tarball in the directory '/var/tmp'.
 ch-pull2tar alpine:latest /var/tmp
-

sheets/ch-run

@@ -2,7 +2,6 @@
 # Utility to run a command in a Charliecloud container.
 # More information: <https://github.com/hpc/charliecloud>.
 
-# Run the command echo hello inside a Charliecloud container using
+# Run the given `echo` command inside a Charliecloud container, using the
-# the unpacked image at /data/foo.
+# unpacked image at '/data/foo'.
 ch-run /data/foo -- echo hello
-

sheets/ch-tar2dir

@@ -2,8 +2,7 @@
 # Utility to unpack a Charliecloud image tarball into a directory.
 # More information: <https://github.com/hpc/charliecloud>.
 
-# Extract the tarball /var/tmp/hello.tar.gz into a subdirectory of /var/tmp.
+# Extract tarball '/var/tmp/hello.tar.gz' into a subdirectory of '/var/tmp'.
-# hello.tar.gz must contain a Linux filesystem image, e.g. as created
+# The tarball must contain a Linux filesystem image, such as is created by
-# by ch-builder2tar.
+# ch-builder2tar.
 ch-tar2dir /var/tmp/hello.tar.gz /var/tmp
-