docs: fix typo in how-to guides (#28951)

This PR is to correct a simple typo in how-to guides section.

Author: YanzhongSu

docs/docs/how_to/installation.mdx

@@ -31,7 +31,7 @@ By default, the dependencies needed to do that are NOT installed. You will need
 ## Ecosystem packages
 
 With the exception of the `langsmith` SDK, all packages in the LangChain ecosystem depend on `langchain-core`, which contains base
-classes and abstractions that other packages use. The dependency graph below shows how the difference packages are related.
+classes and abstractions that other packages use. The dependency graph below shows how the different packages are related.
 A directed arrow indicates that the source package depends on the target package:
 
 ![](/img/ecosystem_packages.png)
@@ -115,4 +115,4 @@ If you want to install a package from source, you can do so by cloning the [main
 pip install -e .
 ```
 
-LangGraph, LangSmith SDK, and certain integration packages live outside the main LangChain repo. You can see [all repos here](https://github.com/langchain-ai).
+LangGraph, LangSmith SDK, and certain integration packages live outside the main LangChain repo. You can see [all repos here](https://github.com/langchain-ai).