Improvement[Community] Improve Document Loaders and Splitters (#27568)

- Fix word spelling error
- Add static method decorator
- Fix language splitter

Co-authored-by: Erick Friis <erick@langchain.dev>

libs/community/langchain_community/document_loaders/pdf.py

@@ -178,7 +178,7 @@ class PyPDFLoader(BasePDFLoader):
 
             loader = PyPDFLoader(
                 file_path = "./example_data/layout-parser-paper.pdf",
-                password = "my-pasword",
+                password = "my-password",
                 extract_images = True,
                 # headers = None
                 # extraction_mode = "plain",
@@ -572,7 +572,8 @@ class MathpixPDFLoader(BasePDFLoader):
         response = requests.get(url, headers=self._mathpix_headers)
         return response.content.decode("utf-8")
 
-    def clean_pdf(self, contents: str) -> str:
+    @staticmethod
+    def clean_pdf(contents: str) -> str:
         """Clean the PDF file.
 
         Args:

libs/text-splitters/langchain_text_splitters/character.py

@@ -465,7 +465,7 @@ class RecursiveCharacterTextSplitter(TextSplitter):
                 "\n\\\\begin{verse}",
                 "\n\\\\begin{verbatim}",
                 # Now split by math environments
-                "\n\\\begin{align}",
+                "\n\\\\begin{align}",
                 "$$",
                 "$",
                 # Now split by the normal type of lines