Fix/spelling error pearson k-means tolerance (#469)

* Minor fixes in algorithms user guide

* Fixes Pearson spelling and K-means default tolerance

exareme2/algorithms/in_database/kmeans.json

@@ -48,7 +48,7 @@
             ],
             "notblank": true,
             "multiple": false,
-            "default": 0.0001,
+            "default": 0.01,
             "min": 0.0,
             "max": 1.0
         }

exareme2/algorithms/in_database/pearson_correlation.json

@@ -6,7 +6,7 @@
     "inputdata": {
         "y": {
             "label": "Variables",
-            "desc": "Nuerical variables on x axis of correlation matrix.",
+            "desc": "Numerical variables on x axis of correlation matrix.",
             "types": [
                 "real",
                 "int"
@@ -19,7 +19,7 @@
         },
         "x": {
             "label": "Covariates (optional)",
-            "desc": "Nuerical variables on y axis of correlation matrix.",
+            "desc": "Numerical variables on y axis of correlation matrix.",
             "types": [
                 "real",
                 "int"