Apply suggestions from code review

Co-authored-by: Wei Ji <23487320+weiji14@users.noreply.github.com>

Author: willschlitzer

pygmt/src/__init__.py

@@ -23,5 +23,5 @@
 from pygmt.src.plot import plot
 from pygmt.src.plot3d import plot3d
 from pygmt.src.surface import surface
-from pygmt.src.text import text
+from pygmt.src.text import text_ as text
 from pygmt.src.which import which

pygmt/src/text.py

@@ -39,7 +39,7 @@
     justify="sequence_comma",
     p="sequence",
 )
-def text(
+def text_(
     self,
     textfiles=None,
     x=None,