[bash/en] Improved descriptions

bash.html.markdown

@@ -51,7 +51,7 @@ echo $Variable
 echo "$Variable"
 echo '$Variable'
 # When you use the variable itself — assign it, export it, or else — you write
-# its name without $. If you want to use variable's value, you should use $.
+# its name without $. If you want to use the variable's value, you should use $.
 # Note that ' (single quote) won't expand the variables!
 
 # String substitution in variables
@@ -70,11 +70,11 @@ echo ${Foo:-"DefaultValueIfFooIsMissingOrEmpty"}
 
 # Builtin variables:
 # There are some useful builtin variables, like
-echo "Last program return value: $?"
+echo "Last program's return value: $?"
 echo "Script's PID: $$"
-echo "Number of arguments: $#"
-echo "Scripts arguments: $@"
-echo "Scripts arguments separated in different variables: $1 $2..."
+echo "Number of arguments passed to script: $#"
+echo "All arguments passed to script: $@"
+echo "Script's arguments separated into different variables: $1 $2..."
 
 # Reading a value from input:
 echo "What's your name?"
@@ -108,8 +108,8 @@ fi
 # Expressions are denoted with the following format:
 echo $(( 10 + 5 ))
 
-# Unlike other programming languages, bash is a shell — so it works in a context
-# of current directory. You can list files and directories in the current
+# Unlike other programming languages, bash is a shell so it works in the context
+# of a current directory. You can list files and directories in the current
 # directory with the ls command:
 ls