docs: fix typos (#1705)

## Summary

Fix typos found via `codespell -S
*.txt,*.yaml,generate_kerning_ligature_epub.py -L
currenty,flate,ser,localy,logicaly,ans,clen,portugues,notin,curren`

## Additional Context

* Add any other information that might be helpful for the reviewer
(e.g., performance implications, potential risks,
  specific areas to focus on).

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Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

lib/OpdsParser/OpdsStream.h

@@ -8,7 +8,7 @@ class OpdsParserStream : public Stream {
  public:
   explicit OpdsParserStream(OpdsParser& parser);
 
-  // That functions are not implimented for that stream
+  // That functions are not implemented for that stream
   int available() override;
   int peek() override;
   int read() override;