docs[patch]: Update install instructions (#5957)

* docs[patch]: Update install instructions

* Update installation.mdx

* Update installation.mdx

docs/core_docs/docs/how_to/installation.mdx

@@ -36,7 +36,7 @@ By default, the dependencies needed to do that are NOT installed. You will need
 We'll show how to do that in the next sections of this guide.
 
 Please also see the section on [installing integration packages](/docs/how_to/installation/#installing-integration-packages)
-for some special considerations.
+for some special considerations when installing LangChain packages.
 
 ## Ecosystem packages
 
@@ -50,6 +50,10 @@ When installing a package, you do not need to explicitly install that package's
 However, you may choose to if you are using a feature only available in a certain version of that dependency.
 If you do, you should make sure that the installed or pinned version is compatible with any other integration packages you use.
 
+**Note:** It is important that your app only uses one version of `@langchain/core`. Common package managers may introduce additional versions
+when resolving dependencies, even if you don't intend this. See [this section on installing integration packages](/docs/how_to/installation/#installing-integration-packages)
+for more information and ways to remedy this.
+
 ### @langchain/community
 
 The [@langchain/community](https://www.npmjs.com/package/@langchain/community) package contains a range of third-party integrations.
@@ -130,6 +134,8 @@ If you are using `yarn`:
 }
 ```
 
+You can also try running the [`yarn dedupe`](https://yarnpkg.com/cli/dedupe) command if you are on `yarn` version 2 or higher.
+
 Or for `npm`:
 
 ```json title="npm package.json"
@@ -150,6 +156,8 @@ Or for `npm`:
 }
 ```
 
+You can also try the [`npm dedupe`](https://docs.npmjs.com/cli/commands/npm-dedupe) command.
+
 Or for `pnpm`:
 
 ```json title="pnpm package.json"
@@ -172,6 +180,8 @@ Or for `pnpm`:
 }
 ```
 
+You can also try the [`pnpm dedupe`](https://pnpm.io/cli/dedupe) command.
+
 ## Loading the library
 
 ### TypeScript