Fix F824 in Bio.PDB.vectors (#5067)

Remove unnecessary global statements

Bio/PDB/vectors.py

@@ -548,10 +548,7 @@ def coord_space(
     # a1 = acs[1]
     # a2 = acs[2]
 
-    global gtm
-    global gmry
-    global gmrz, gmrz2
-
+    # the gtm, gmry, gmrz, and gmrz2 variables are read from the global namespace
     tm = gtm
     mry = gmry
     mrz = gmrz

CONTRIB.rst

@@ -259,6 +259,7 @@ please open an issue on GitHub or mention it on the mailing list.
 - Micky Yun Chan <https://github.com/michiboo>
 - Mike Moritz <https://github.com/mikepmikepm35>
 - Mike Poidinger <Michael.Poidinger at domain eBioinformatics.com>
+- Mikel Martinez Goikoetxea <https://github.com/Mikel-MG>
 - Milind Luthra <https://github.com/milindl>
 - morrme <https://github.com/morrme>
 - Mustafa Anil Tuncel <https://github.com/anilbey>