@@ -143,9 +143,9 @@ class PVSystem:
143143    module : string, optional 
144144        The model name of the modules. 
145145
146-     module_type : string, default ` glass_polymer`  
147-          Describes the module's construction. Valid strings are ` glass_polymer`  
148-          and ` glass_glass` . Used for cell and module temperature calculations. 
146+     module_type : string, default ' glass_polymer'  
147+          Describes the module's construction. Valid strings are ' glass_polymer'  
148+          and ' glass_glass' . Used for cell and module temperature calculations. 
149149
150150    module_parameters : dict or Series, optional 
151151        Module parameters as defined by the SAPM, CEC, or other. 
@@ -168,8 +168,8 @@ class PVSystem:
168168        Inverter parameters as defined by the SAPM, CEC, or other. 
169169
170170    racking_model : string, optional 
171-         Valid strings are ` open_rack`, ` close_mount`, ` freestanding` , or 
172-         ` insulated_back` . 
171+         Valid strings are ' open_rack', ' close_mount', ' freestanding' , or 
172+         ' insulated_back' . 
173173        Used to identify a parameter set for the cell temperature model. 
174174
175175    losses_parameters : dict or Series, optional 
@@ -1372,8 +1372,8 @@ class FixedMount(AbstractMount):
13721372        West=270. [degrees] 
13731373
13741374    racking_model : str, optional 
1375-         Valid strings are ` open_rack`, ` close_mount`, ` freestanding` , or 
1376-         ` insulated_back` . 
1375+         Valid strings are ' open_rack', ' close_mount', ' freestanding' , or 
1376+         ' insulated_back' . 
13771377        Used to identify a parameter set for the cell temperature model. 
13781378
13791379    module_height : float, optional 
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