Improve grammar of PlaceholderExpansion.md

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@ -29,7 +29,6 @@ For starters, you need to decide what type of [`PlaceholderExpansion`][placehold
### Common Parts
All shown examples will share the same common parts that belong to the [`PlaceholderExpansion`][placeholderexpansion] class.
In order to not repeat the same basic info for each method throughout this page, and to greatly reduce its overall length, we will cover the most basic/necessary ones here.
``
#### Basic PlaceholderExpansion Structure
```java
@ -62,9 +61,9 @@ Let's quickly break down the different methods you have to implement.
This method allows you to set the name of the expansion's author.
- #### getIdentifier
The name that should be used to identify the placeholders for this expansion.
The identifier is the string after the starting `%` and before the first `_` (`%identifier_values%`) and, therefore, cannot contain any `_`s.
The identifier is the string after the starting `%` and before the first `_` (`%identifier_values%`) and, therefore, cannot contain `_`, `%` or spaces.
If you want to use `_` in your expansion's name, you can override the optional `getName()` method.
If you still want to use the previously mentioned symbols can you override the `getName()` method to change the Expansion's displayname.
- #### getVersion
This is a string, which means it can contain more than just a number. This is used to determine if a new update is available or not when the expansion is shared on the eCloud.
For expansions that are part of a plugin, this does not really matter.