merge from 3.2 - Fix closes Issue12621 - Fix docstrings of find and rfind…

merge from 3.2 - Fix closes Issue12621 - Fix docstrings of find and rfind methods of bytes/bytearry/unicodeobject.

Objects/bytearrayobject.c

@@ -1170,7 +1170,7 @@ PyDoc_STRVAR(find__doc__,
 "B.find(sub [,start [,end]]) -> int\n\
 \n\
 Return the lowest index in B where subsection sub is found,\n\
-such that sub is contained within s[start,end].  Optional\n\
+such that sub is contained within B[start,end].  Optional\n\
 arguments start and end are interpreted as in slice notation.\n\
 \n\
 Return -1 on failure.");
@@ -1240,7 +1240,7 @@ PyDoc_STRVAR(rfind__doc__,
 "B.rfind(sub [,start [,end]]) -> int\n\
 \n\
 Return the highest index in B where subsection sub is found,\n\
-such that sub is contained within s[start,end].  Optional\n\
+such that sub is contained within B[start,end].  Optional\n\
 arguments start and end are interpreted as in slice notation.\n\
 \n\
 Return -1 on failure.");

Objects/stringobject.c

@@ -1727,7 +1727,7 @@ PyDoc_STRVAR(find__doc__,
 "S.find(sub [,start [,end]]) -> int\n\
 \n\
 Return the lowest index in S where substring sub is found,\n\
-such that sub is contained within s[start:end].  Optional\n\
+such that sub is contained within S[start:end].  Optional\n\
 arguments start and end are interpreted as in slice notation.\n\
 \n\
 Return -1 on failure.");
@@ -1766,7 +1766,7 @@ PyDoc_STRVAR(rfind__doc__,
 "S.rfind(sub [,start [,end]]) -> int\n\
 \n\
 Return the highest index in S where substring sub is found,\n\
-such that sub is contained within s[start:end].  Optional\n\
+such that sub is contained within S[start:end].  Optional\n\
 arguments start and end are interpreted as in slice notation.\n\
 \n\
 Return -1 on failure.");

Objects/unicodeobject.c

@@ -6491,7 +6491,7 @@ PyDoc_STRVAR(find__doc__,
              "S.find(sub [,start [,end]]) -> int\n\
 \n\
 Return the lowest index in S where substring sub is found,\n\
-such that sub is contained within s[start:end].  Optional\n\
+such that sub is contained within S[start:end].  Optional\n\
 arguments start and end are interpreted as in slice notation.\n\
 \n\
 Return -1 on failure.");
@@ -7226,7 +7226,7 @@ PyDoc_STRVAR(rfind__doc__,
              "S.rfind(sub [,start [,end]]) -> int\n\
 \n\
 Return the highest index in S where substring sub is found,\n\
-such that sub is contained within s[start:end].  Optional\n\
+such that sub is contained within S[start:end].  Optional\n\
 arguments start and end are interpreted as in slice notation.\n\
 \n\
 Return -1 on failure.");