Figure.text: Fix link to "Technical Reference/Supported Encodings..." (#3354)

Author: yvonnefroehlich

pygmt/src/text.py

@@ -63,7 +63,7 @@ def text_(  # noqa: PLR0912
     The text strings passed via the ``text`` parameter can contain ASCII characters and
     non-ASCII characters defined in the Adobe ISOLatin1+, Adobe Symbol, Adobe
     ZapfDingbats and ISO-8859-x (x can be 1-11, 13-16) encodings. Refer to
-    :doc:`techref/encodings` for the full list of supported non-ASCII characters.
+    :doc:`/techref/encodings` for the full list of supported non-ASCII characters.
 
     Full option list at :gmt-docs:`text.html`.