Simplify sentences by dropping 'simply'

Increases readability and clarity.

Using 'simply' can indicate that actions are simple. But adding it without a need for differentiation or qualification, they increase sentence complexity, making it harder to read and parse. The statements remain just as valid without them.

book/modules/using_modules.md

@@ -25,7 +25,7 @@ The example above uses the [Standard Library](../standard_library.md), a collect
 
 ## Installing Modules
 
-Installing a module is simply a matter of placing its files in a directory. This might be done via `git clone` (or other version control system), a package manager such as `nupm`, or manually. The module's documentation should provide recommendations.
+Installing a module is a matter of placing its files in a directory. This might be done via `git clone` (or other version control system), a package manager such as `nupm`, or manually. The module's documentation should provide recommendations.
 
 ## Importing Modules
 
@@ -217,11 +217,11 @@ assert true
 ```
 
 ::: tip
-`main` is covered in more detail in [Creating Modules](./creating_modules.md#main-exports), but for end-users, `main` simply means "the command named the same as the module." In this case the `assert` module exports a `main` command that "masquerades" as the `assert` command. Hiding `main` has the effect of hiding the `assert` command, but not its subcommands.
+`main` is covered in more detail in [Creating Modules](./creating_modules.md#main-exports), but for end-users, `main` means "the command named the same as the module." In this case the `assert` module exports a `main` command that "masquerades" as the `assert` command. Hiding `main` has the effect of hiding the `assert` command, but not its subcommands.
 :::
 
 ## See Also
 
-- To make a module always be available without having to `use` it in each Nushell session, simply add its import (`use`) to your startup configuration. See the [Configuration](../configuration.md) Chapter to learn how.
+- To make a module always be available without having to `use` it in each Nushell session, add its import (`use`) to your startup configuration. See the [Configuration](../configuration.md) Chapter to learn how.
 
 - Modules can also be used as part of an [Overlay](../overlays.md).