Fixed multiple typos

A few "a->an" and "an->a".
"Shows, if the supplied default SOCKS5 proxy" -> "Shows if the supplied default SOCKS5 proxy". Change made on 3 occurrences.
"without fully understanding the ramification of a command" -> "without fully understanding the ramifications of a command".
Removed duplicate words such as "the the".

src/secp256k1/sage/group_prover.sage

@@ -3,7 +3,7 @@
 # to independently set assumptions on input or intermediary variables.
 #
 # The general approach is:
-# * A constraint is a tuple of two sets of of symbolic expressions:
+# * A constraint is a tuple of two sets of symbolic expressions:
 #   the first of which are required to evaluate to zero, the second of which
 #   are required to evaluate to nonzero.
 #   - A constraint is said to be conflicting if any of its nonzero expressions

src/secp256k1/src/asm/field_10x26_arm.s

@@ -11,7 +11,7 @@ Note:
 
 - To avoid unnecessary loads and make use of available registers, two
   'passes' have every time been interleaved, with the odd passes accumulating c' and d' 
-  which will be added to c and d respectively in the the even passes
+  which will be added to c and d respectively in the even passes
 
 */