docs: remove_last and replace_last

docs/source/filters/remove_last.md

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+---
+title: remove_last
+---
+
+{% since %}v10.2.0{% endsince %}
+
+Removes only the last occurrence of the specified substring from a string.
+
+Input
+```liquid
+{{ "I strained to see the train through the rain" | remove_last: "rain" }}
+```
+
+Output
+```text
+I strained to see the train through the
+```

docs/source/filters/replace_last.md

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+---
+title: replace_last
+---
+
+{% since %}v10.2.0{% endsince %}
+
+Replaces only the last occurrence of the first argument in a string with the second argument.
+
+Input
+```liquid
+{{ "Take my protein pills and put my helmet on" | replace_last: "my", "your" }}
+```
+
+Output
+```text
+Take my protein pills and put your helmet on
+```