fix(docs): Correct import statement for InMemorySaver in conceptual docs (#5797)

Fixes #5781

Fixes the incorrect import statement in the Python documentation
tutorial.

- Changed import from `MemorySaver` to `InMemorySaver`
- Ensures consistency between import statement and class instantiation
- Verified through formatting and linting checks

The documentation now correctly reflects the proper import for the
InMemorySaver class.

---------

Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>

docs/docs/tutorials/get-started/3-add-memory.md

@@ -17,7 +17,7 @@ Create a `MemorySaver` checkpointer:
 :::python
 
 ```python
-from langgraph.checkpoint.memory import MemorySaver
+from langgraph.checkpoint.memory import InMemorySaver
 
 memory = InMemorySaver()
 ```
@@ -447,3 +447,4 @@ const graph = new StateGraph(State)
 ## Next steps
 
 In the next tutorial, you will [add human-in-the-loop to the chatbot](./4-human-in-the-loop.md) to handle situations where it may need guidance or verification before proceeding.
+

docs/uv.lock

@@ -2524,6 +2524,7 @@ docs = [
     { name = "markdown-include" },
     { name = "mkdocs" },
     { name = "mkdocs-exclude" },
+    { name = "mkdocs-exclude-search" },
     { name = "mkdocs-git-committers-plugin-2" },
     { name = "mkdocs-include-markdown-plugin" },
     { name = "mkdocs-material", extra = ["imaging"] },
@@ -2595,6 +2596,7 @@ docs = [
     { name = "markdown-include" },
     { name = "mkdocs" },
     { name = "mkdocs-exclude" },
+    { name = "mkdocs-exclude-search" },
     { name = "mkdocs-git-committers-plugin-2" },
     { name = "mkdocs-include-markdown-plugin", specifier = ">=7.1.6" },
     { name = "mkdocs-material", extras = ["imaging"] },
@@ -3030,6 +3032,18 @@ dependencies = [
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/54/b5/3a8e289282c9e8d7003f8a2f53d673d4fdaa81d493dc6966092d9985b6fc/mkdocs-exclude-1.0.2.tar.gz", hash = "sha256:ba6fab3c80ddbe3fd31d3e579861fd3124513708271180a5f81846da8c7e2a51", size = 6751, upload-time = "2019-02-20T23:34:12.81Z" }
 
+[[package]]
+name = "mkdocs-exclude-search"
+version = "0.6.6"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "mkdocs" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/1d/52/8243589d294cf6091c1145896915fe50feea0e91d64d843942d0175770c2/mkdocs-exclude-search-0.6.6.tar.gz", hash = "sha256:3cdff1b9afdc1b227019cd1e124f401453235b92153d60c0e5e651a76be4f044", size = 9501, upload-time = "2023-12-03T22:58:21.259Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/3b/ef/9af45ffb1bdba684a0694922abae0bb771e9777aba005933f838b7f1bcea/mkdocs_exclude_search-0.6.6-py3-none-any.whl", hash = "sha256:2b4b941d1689808db533fe4a6afba75ce76c9bab8b21d4e31efc05fd8c4e0a4f", size = 7821, upload-time = "2023-12-03T22:58:19.355Z" },
+]
+
 [[package]]
 name = "mkdocs-get-deps"
 version = "0.2.0"